diff --git a/Exercise Library/Back Extension/frames/frame-1.svg b/Exercise Library/Back Extension/frames/frame-1.svg
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+
diff --git a/Exercise Library/Back Extension/frames/frame-2.svg b/Exercise Library/Back Extension/frames/frame-2.svg
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+
diff --git a/Exercise Library/Back Extension/info.md b/Exercise Library/Back Extension/info.md
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+# Back Extension
+
+The roman-chair hinge — hips anchored on the pad, fold forward, then raise
+the trunk back in line with the legs.
+
+- **Category:** Main circuit
+- **Type:** Machine-based back extension (hip hinge)
+- **Targets:** Spinal erectors, glutes, hamstrings
+- **Prescription:** 3 × 10–15
+
+## Setup
+
+Set the pad so its top edge sits at the crease of your hips — you must be
+able to fold freely over it. Hook your heels under the ankle rollers,
+cross your arms over your chest.
+
+## Execution
+
+1. Fold forward over the pad with a controlled, mostly-flat back.
+2. Lower until the hamstrings stop you, without going slack.
+3. Squeeze glutes and back to raise the trunk until it lines up with the
+ legs — no higher.
+
+## Cues
+
+- Movement comes from the hips with the back held long.
+- Rise to a straight body line, not into an arch.
+- Slow down; momentum does nothing here.
+
+## Common Mistakes
+
+- Pad set too high, blocking the hinge.
+- Hyperextending past the body line at the top.
+- Swinging up with momentum.
+
+## Progression
+
+Slow the lowering phase, add a pause at the top, then hold a plate to the
+chest for load.
diff --git a/Exercise Library/Back Extension/motion.json b/Exercise Library/Back Extension/motion.json
new file mode 100644
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+++ b/Exercise Library/Back Extension/motion.json
@@ -0,0 +1,37 @@
+{
+ "name": "Back Extension",
+ "primary": 2,
+ "working": ["spine"],
+ "props": [
+ {"type": "scene", "shapes": [
+ {"kind": "line", "pts": [[102, 124], [154, 106]], "w": 9, "depth": 8},
+ {"kind": "line", "pts": [[130, 122], [130, 150]], "w": 5},
+ {"kind": "line", "pts": [[58, 142], [88, 142]], "w": 5, "depth": 6}
+ ]},
+ {"type": "roller", "at": ["foot_r", "foot_l"], "r": 4.5, "side": 1, "back": 4}
+ ],
+ "frames": [
+ {
+ "hold": 0.4, "tween": 1.0,
+ "root": {"pos": [150, 102], "pitch": 112},
+ "spine": [0, 12],
+ "neck": 10, "head": -30,
+ "shoulder_r": 30, "elbow_r": 140,
+ "shoulder_l": 30, "elbow_l": 140,
+ "hip_r": 48, "knee_r": 12, "ankle_r": 12,
+ "hip_l": 48, "knee_l": 12, "ankle_l": 12,
+ "pins": {"foot_r": [72, 136], "foot_l": [76, 138]}
+ },
+ {
+ "hold": 0.6, "tween": 1.1,
+ "root": {"pos": [150, 102], "pitch": 65},
+ "spine": [0, -6],
+ "neck": 5, "head": -55,
+ "shoulder_r": 30, "elbow_r": 140,
+ "shoulder_l": 30, "elbow_l": 140,
+ "hip_r": 2, "knee_r": 12, "ankle_r": 12,
+ "hip_l": 2, "knee_l": 12, "ankle_l": 12,
+ "pins": {"foot_r": [72, 136], "foot_l": [76, 138]}
+ }
+ ]
+}
diff --git a/Exercise Library/Back Extension/orbit.gif b/Exercise Library/Back Extension/orbit.gif
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+
diff --git a/Exercise Library/Deadlift/frames/frame-1.svg b/Exercise Library/Deadlift/frames/frame-1.svg
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+++ b/Exercise Library/Deadlift/frames/frame-1.svg
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+
diff --git a/Exercise Library/Deadlift/frames/frame-2.svg b/Exercise Library/Deadlift/frames/frame-2.svg
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+++ b/Exercise Library/Deadlift/frames/frame-2.svg
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+
diff --git a/Exercise Library/Deadlift/info.md b/Exercise Library/Deadlift/info.md
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+# Deadlift
+
+The barbell hip hinge — brace hard, then stand up with the bar by driving
+the hips through.
+
+- **Category:** Main circuit
+- **Type:** Free-weight compound hinge
+- **Targets:** Glutes, hamstrings, spinal erectors, grip
+- **Prescription:** 4 × 6–8
+
+## Setup
+
+Stand with the bar over mid-foot, feet hip-width. Hinge down with a flat
+back and grip the bar just outside your legs. Shoulders slightly ahead of
+the bar, hips higher than knees, chest up.
+
+## Execution
+
+1. Take the slack out of the bar, brace your trunk, then push the floor
+ away — hips and shoulders rise together.
+2. Once the bar passes the knees, drive the hips forward to stand tall.
+3. Lower under control by hinging at the hips first, then bending the
+ knees once the bar clears them.
+
+## Cues
+
+- Flat back from setup to lockout — the spine never rounds or overarches.
+- Keep the bar dragging close to the legs the whole way.
+- Finish with glutes, not by leaning back.
+
+## Common Mistakes
+
+- Squatting the weight up — hips too low, knees pushed forward.
+- Rounding the lower back off the floor.
+- Jerking the bar off the ground instead of pushing through the legs.
+
+## Progression
+
+Add weight in small jumps while all reps stay flat-backed; start from
+blocks or a rack if floor mobility isn't there yet.
diff --git a/Exercise Library/Deadlift/motion.json b/Exercise Library/Deadlift/motion.json
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+++ b/Exercise Library/Deadlift/motion.json
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+{
+ "name": "Deadlift",
+ "primary": 1,
+ "camera": {"zoom": 0.7},
+ "working": ["leg_r", "leg_l", "spine"],
+ "props": [
+ {"type": "bar", "at": ["hand_r", "hand_l"], "halfLen": 26, "plateR": 16}
+ ],
+ "frames": [
+ {
+ "hold": 0.4, "tween": 1.0,
+ "root": {"pos": [92, 90], "pitch": 78},
+ "spine": [0, -6],
+ "neck": 5, "head": -70,
+ "shoulder_r": 75, "elbow_r": 5,
+ "shoulder_l": 75, "elbow_l": 5,
+ "hip_r": 115, "knee_r": 30, "ankle_r": 15,
+ "hip_l": 115, "knee_l": 30, "ankle_l": 15,
+ "pins": {"foot_r": [150, 147], "foot_l": [154, 149],
+ "hand_r": [156, 130], "hand_l": [160, 132]}
+ },
+ {
+ "hold": 0.4, "tween": 1.2,
+ "root": {"pos": [150, 64], "pitch": 10},
+ "spine": [0, 0],
+ "neck": 2, "head": -8,
+ "shoulder_r": 10, "elbow_r": 3,
+ "shoulder_l": 10, "elbow_l": 3,
+ "hip_r": 8, "knee_r": 5, "ankle_r": 0,
+ "hip_l": 8, "knee_l": 5, "ankle_l": 0,
+ "pins": {"foot_r": [150, 147], "foot_l": [154, 149],
+ "hand_r": [161, 38], "hand_l": [165, 40]}
+ }
+ ]
+}
diff --git a/Exercise Library/Deadlift/orbit.gif b/Exercise Library/Deadlift/orbit.gif
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diff --git a/Exercise Library/Deadlift/visual.svg b/Exercise Library/Deadlift/visual.svg
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+
diff --git a/Exercise Library/Glute Bridge/frames/frame-1.svg b/Exercise Library/Glute Bridge/frames/frame-1.svg
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--- /dev/null
+++ b/Exercise Library/Glute Bridge/frames/frame-1.svg
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+
diff --git a/Exercise Library/Glute Bridge/frames/frame-2.svg b/Exercise Library/Glute Bridge/frames/frame-2.svg
new file mode 100644
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--- /dev/null
+++ b/Exercise Library/Glute Bridge/frames/frame-2.svg
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+
diff --git a/Exercise Library/Glute Bridge/info.md b/Exercise Library/Glute Bridge/info.md
new file mode 100644
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+++ b/Exercise Library/Glute Bridge/info.md
@@ -0,0 +1,39 @@
+# Glute Bridge
+
+The floor hip hinge — drive through the heels and lift the hips until the
+body is a straight line from shoulders to knees.
+
+- **Category:** Warm-up and main circuit
+- **Type:** Hip extension (floor)
+- **Targets:** Glutes, hamstrings
+- **Prescription:** 3 × 12–15, squeeze at the top
+
+## Setup
+
+Lie on your back, knees bent, feet flat on the floor about hip-width and
+close enough that your fingertips can graze your heels. Arms rest at your
+sides.
+
+## Execution
+
+1. Press through the heels and squeeze the glutes to lift the hips.
+2. Stop when shoulders, hips and knees form a straight line — no arching
+ past it.
+3. Hold the squeeze for a beat, then lower with control.
+
+## Cues
+
+- The glutes lift the hips; the lower back just comes along.
+- Ribs stay down — finish with the glutes, not by overarching.
+- Knees track over the feet, never falling inward or out.
+
+## Common Mistakes
+
+- Pushing through the toes instead of the heels.
+- Overarching the lower back at the top.
+- Bouncing reps off the floor.
+
+## Progression
+
+Pause holds at the top, then single-leg bridges; graduate to the barbell
+Hip Thrust for load.
diff --git a/Exercise Library/Glute Bridge/motion.json b/Exercise Library/Glute Bridge/motion.json
new file mode 100644
index 0000000..a9e19b1
--- /dev/null
+++ b/Exercise Library/Glute Bridge/motion.json
@@ -0,0 +1,29 @@
+{
+ "name": "Glute Bridge",
+ "primary": 2,
+ "working": ["leg_r", "leg_l"],
+ "frames": [
+ {
+ "hold": 0.4, "tween": 0.8,
+ "root": {"pos": [168, 144], "pitch": -90},
+ "spine": [0, 0],
+ "neck": 20, "head": -6,
+ "shoulder_r": -4, "elbow_r": 0,
+ "shoulder_l": -4, "elbow_l": 0,
+ "hip_r": 72, "knee_r": 82, "ankle_r": 5,
+ "hip_l": 72, "knee_l": 82, "ankle_l": 5,
+ "pins": {"foot_r": [205, 148], "foot_l": [209, 150]}
+ },
+ {
+ "hold": 0.9, "tween": 1.0,
+ "root": {"pos": [172, 116], "pitch": -110},
+ "spine": [0, -4],
+ "neck": 48, "head": -6,
+ "shoulder_r": -14, "elbow_r": 0,
+ "shoulder_l": -14, "elbow_l": 0,
+ "hip_r": 16, "knee_r": 92, "ankle_r": 5,
+ "hip_l": 16, "knee_l": 92, "ankle_l": 5,
+ "pins": {"foot_r": [205, 148], "foot_l": [209, 150]}
+ }
+ ]
+}
diff --git a/Exercise Library/Glute Bridge/preview.gif b/Exercise Library/Glute Bridge/preview.gif
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diff --git a/Exercise Library/Glute Bridge/visual.svg b/Exercise Library/Glute Bridge/visual.svg
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+
diff --git a/Exercise Library/Hip Thrust/frames/frame-1.svg b/Exercise Library/Hip Thrust/frames/frame-1.svg
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--- /dev/null
+++ b/Exercise Library/Hip Thrust/frames/frame-1.svg
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+
diff --git a/Exercise Library/Hip Thrust/frames/frame-2.svg b/Exercise Library/Hip Thrust/frames/frame-2.svg
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--- /dev/null
+++ b/Exercise Library/Hip Thrust/frames/frame-2.svg
@@ -0,0 +1,24 @@
+
diff --git a/Exercise Library/Hip Thrust/info.md b/Exercise Library/Hip Thrust/info.md
new file mode 100644
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--- /dev/null
+++ b/Exercise Library/Hip Thrust/info.md
@@ -0,0 +1,38 @@
+# Hip Thrust
+
+The loaded glute bridge — shoulders on a bench, barbell across the hips,
+drive the hips up to a straight line.
+
+- **Category:** Main circuit
+- **Type:** Free-weight hip extension
+- **Targets:** Glutes, hamstrings
+- **Prescription:** 4 × 8–10
+
+## Setup
+
+Sit on the floor with your upper back against a bench, the bar (padded)
+across your hips, hands steadying it. Feet flat, hip-width, heels under
+the knees.
+
+## Execution
+
+1. Brace, tuck the chin, and drive through the heels to lift the hips.
+2. Stop when shoulders, hips and knees are level — a flat tabletop.
+3. Squeeze the glutes at the top, then lower the hips under control.
+
+## Cues
+
+- Chin tucked, ribs down — the body hinges around the bench edge.
+- Full lockout comes from the glutes, not from arching the back.
+- Shins vertical at the top; adjust foot distance until they are.
+
+## Common Mistakes
+
+- Overarching the lower back instead of finishing with the glutes.
+- Feet too far forward, turning it into a hamstring exercise.
+- Cutting the range short at the top.
+
+## Progression
+
+Start with the bar alone to groove the pattern, then add plates; pause
+reps at the top for extra glute work.
diff --git a/Exercise Library/Hip Thrust/motion.json b/Exercise Library/Hip Thrust/motion.json
new file mode 100644
index 0000000..37e7362
--- /dev/null
+++ b/Exercise Library/Hip Thrust/motion.json
@@ -0,0 +1,38 @@
+{
+ "name": "Hip Thrust",
+ "primary": 2,
+ "working": ["leg_r", "leg_l"],
+ "props": [
+ {"type": "scene", "shapes": [
+ {"kind": "line", "pts": [[50, 122], [88, 122]], "w": 9, "depth": 8},
+ {"kind": "line", "pts": [[68, 127], [68, 150]], "w": 5}
+ ]},
+ {"type": "bar", "at": ["hand_r", "hand_l"], "halfLen": 26, "plateR": 13}
+ ],
+ "frames": [
+ {
+ "hold": 0.4, "tween": 0.8,
+ "root": {"pos": [150, 136], "pitch": -75},
+ "spine": [0, 6],
+ "neck": 42, "head": -4,
+ "shoulder_r": 4, "elbow_r": 8,
+ "shoulder_l": 4, "elbow_l": 8,
+ "hip_r": 78, "knee_r": 88, "ankle_r": 5,
+ "hip_l": 78, "knee_l": 88, "ankle_l": 5,
+ "pins": {"foot_r": [203, 147], "foot_l": [207, 149],
+ "hand_r": [124, 127], "hand_l": [128, 129]}
+ },
+ {
+ "hold": 0.9, "tween": 1.0,
+ "root": {"pos": [152, 114], "pitch": -89},
+ "spine": [0, 2],
+ "neck": 48, "head": -4,
+ "shoulder_r": 4, "elbow_r": 8,
+ "shoulder_l": 4, "elbow_l": 8,
+ "hip_r": 24, "knee_r": 92, "ankle_r": 5,
+ "hip_l": 24, "knee_l": 92, "ankle_l": 5,
+ "pins": {"foot_r": [203, 147], "foot_l": [207, 149],
+ "hand_r": [126, 111], "hand_l": [130, 113]}
+ }
+ ]
+}
diff --git a/Exercise Library/Hip Thrust/orbit.gif b/Exercise Library/Hip Thrust/orbit.gif
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diff --git a/Exercise Library/Hip Thrust/visual.svg b/Exercise Library/Hip Thrust/visual.svg
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+
diff --git a/Exercise Library/Romanian Deadlift/frames/frame-1.svg b/Exercise Library/Romanian Deadlift/frames/frame-1.svg
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--- /dev/null
+++ b/Exercise Library/Romanian Deadlift/frames/frame-1.svg
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+
diff --git a/Exercise Library/Romanian Deadlift/frames/frame-2.svg b/Exercise Library/Romanian Deadlift/frames/frame-2.svg
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--- /dev/null
+++ b/Exercise Library/Romanian Deadlift/frames/frame-2.svg
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+
diff --git a/Exercise Library/Romanian Deadlift/info.md b/Exercise Library/Romanian Deadlift/info.md
new file mode 100644
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+++ b/Exercise Library/Romanian Deadlift/info.md
@@ -0,0 +1,39 @@
+# Romanian Deadlift
+
+The stretch-focused hip hinge — push the hips back with soft knees until
+the hamstrings stop you, then stand back up. Barbell or dumbbells.
+
+- **Category:** Main circuit
+- **Type:** Free-weight hinge (barbell or dumbbells)
+- **Targets:** Hamstrings, glutes, spinal erectors
+- **Prescription:** 3 × 8–10
+
+## Setup
+
+Stand tall holding the bar (or dumbbells) at the hips, feet hip-width,
+knees unlocked. Set your shoulders back and brace.
+
+## Execution
+
+1. Push the hips straight back and let the weight slide down the thighs,
+ back flat, knees only slightly bent.
+2. Stop when the hamstrings are fully stretched — usually just below the
+ knees — without the back rounding.
+3. Drive the hips forward to stand tall again.
+
+## Cues
+
+- The hips travel backward, not down — this is not a squat.
+- Weight stays close to the legs the whole rep.
+- Feel the hamstrings load on the way down; that stretch is the exercise.
+
+## Common Mistakes
+
+- Bending the knees more as the weight lowers, turning it into a deadlift.
+- Rounding the back to reach the floor — depth comes from the hips.
+- Rushing the lowering phase.
+
+## Progression
+
+Add weight once the full stretch is reached with a flat back every rep;
+single-leg RDLs for balance and asymmetry work.
diff --git a/Exercise Library/Romanian Deadlift/motion.json b/Exercise Library/Romanian Deadlift/motion.json
new file mode 100644
index 0000000..fd247e1
--- /dev/null
+++ b/Exercise Library/Romanian Deadlift/motion.json
@@ -0,0 +1,35 @@
+{
+ "name": "Romanian Deadlift",
+ "primary": 1,
+ "camera": {"zoom": 0.7},
+ "working": ["leg_r", "leg_l", "spine"],
+ "props": [
+ {"type": "bar", "at": ["hand_r", "hand_l"], "halfLen": 26, "plateR": 13}
+ ],
+ "frames": [
+ {
+ "hold": 0.4, "tween": 0.9,
+ "root": {"pos": [90, 92], "pitch": 68},
+ "spine": [0, -6],
+ "neck": 5, "head": -62,
+ "shoulder_r": 66, "elbow_r": 4,
+ "shoulder_l": 66, "elbow_l": 4,
+ "hip_r": 112, "knee_r": 12, "ankle_r": 12,
+ "hip_l": 112, "knee_l": 12, "ankle_l": 12,
+ "pins": {"foot_r": [158, 147], "foot_l": [162, 149],
+ "hand_r": [167, 120], "hand_l": [171, 122]}
+ },
+ {
+ "hold": 0.4, "tween": 1.4,
+ "root": {"pos": [158, 64], "pitch": 10},
+ "spine": [0, 0],
+ "neck": 2, "head": -8,
+ "shoulder_r": 10, "elbow_r": 3,
+ "shoulder_l": 10, "elbow_l": 3,
+ "hip_r": 8, "knee_r": 8, "ankle_r": 0,
+ "hip_l": 8, "knee_l": 8, "ankle_l": 0,
+ "pins": {"foot_r": [158, 147], "foot_l": [162, 149],
+ "hand_r": [169, 38], "hand_l": [173, 40]}
+ }
+ ]
+}
diff --git a/Exercise Library/Romanian Deadlift/preview.gif b/Exercise Library/Romanian Deadlift/preview.gif
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+++ b/Exercise Library/Romanian Deadlift/visual.svg
@@ -0,0 +1,22 @@
+