Jump and catchCentre of mass inside base of support
Side view
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Hang clean

A 60 kg bar from the hips to just above the knees, then an explosive extension and a pull under the bar into a full front squat to catch it, and stand up. Same rig as the hang power clean with a full-depth catch.

2°Ankle dorsiflexion
2°Knee flexion
7°Hip flexion
1°Trunk from vertical
11°Arm to trunk
2°Elbow flexion
36Ankle spacing, cm
62Hand spacing, cm
-5Knee outside ankle, cm
–Knee cave, ° inside toe line
50 / 50Load left / right, %
0Pelvis drop, cm

Load and joint demand

Load in the model: 60 kg. Balance and joint demand re-solve as you change it.

Lower back
11 / 286
Hip extensors
6 / 165
Knee extensors
18 / 104
Calves
40 / 40
Shoulder, per side
38 / 51
Elbow, per side
17 / 81

N·m now / peak over the rep.

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
Hamstrings
64 pts
Upper back
46 pts
Calves and shins
35 pts

Effort and your quota

9.5/10 effort9.9fatigue per set

Your quota per set: 10 reps at 60 kg, stopping 2 reps short of failure.

One hard set earns 271 legs points, 46 pull points.

Prime movers

Quadriceps, gluteus maximus, hamstrings, trapezius, upper back, calves.

What to look for

  • Jump, then pull yourself all the way under.
  • Catch in a deep squat with the elbows high.
  • Stand up like a front squat.
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.