Lower, eccentric
Side view
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Leg press

45° sled, seat reclined 45°. Feet on the plate at hip width; the plate travels along a fixed line and the knees are solved by IK. No balance check because the seat carries the body.

26°Ankle dorsiflexion
55°Knee flexion
111°Hip flexion
45°Trunk from vertical
17°Arm to trunk
24°Elbow flexion
30Ankle spacing, cm
60Hand spacing, cm
4Knee outside ankle, cm
–Knee cave, ° inside toe line
–Load left / right, %
0Pelvis drop, cm

Load and joint demand

Machine or cable load (150 kg at this setting) is not modelled, so joint demand shows the body only.

No gravity-based joint demand to show for this exercise.

Faults

Faults grow with knee bend and apply to lifts standing on the floor. The fault check flags a knee caving more than 10° inside the line of the toes and a load split beyond 60/40. Knee cave shows best in the front camera.

Body

Femur changes keep standing height fixed by shortening or lengthening the torso. Longer femurs force more forward lean in any squat.

Muscles worked

Quads
100 pts
Glutes
82 pts
Adductors
64 pts

Effort and your quota

7/10 effort7.3fatigue per set

Your quota per set: 10 reps at 150 kg, stopping 2 reps short of failure.

One hard set earns 246 legs points.

Prime movers

Quadriceps, gluteus maximus, adductor magnus.

What to look for

  • Lower back stays on the pad; depth is limited by where the pelvis starts to tuck.
  • Knees track the toes; turn up knee cave to see the fault in 3D.
How the model works, and its limits

One 3D skeleton drives both views. Segment lengths and widths are Winter's anthropometric ratios of height; segment masses and centre-of-mass positions follow Dempster's data. For free-standing lifts the whole-body angle is found numerically so the combined centre of mass of lifter and load sits over the middle of the foot. Arms and legs use two-link inverse kinematics with a pole direction. Rep timing follows a minimum-jerk profile.

Balance is quasi-static, so ballistic lifts are shown slowed down. Cable pull and pad support forces are not modelled. The spine is one rigid segment and joints have no range-of-motion limits or muscle forces.