Lower and squatBalanced over midfoot
Side view
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Double kettlebell thruster

A front squat with two 16 kg bells in the rack, driving straight into a press as the legs finish extending.

1°Ankle dorsiflexion
2°Knee flexion
9°Hip flexion
5°Trunk from vertical
171°Arm to trunk
20°Elbow flexion
44Ankle spacing, cm
34Hand spacing, cm
-6Knee outside ankle, cm
–Knee cave, ° inside toe line
50 / 50Load left / right, %
0Pelvis drop, cm

Load and joint demand

Load in the model: 16 kg each hand. Balance and joint demand re-solve as you change it.

Lower back
37 / 193
Hip extensors
21 / 113
Knee extensors
32 / 87
Calves
52 / 52
Shoulder, per side
7 / 35
Elbow, per side
12 / 46

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
Shoulders
64 pts
Triceps
46 pts
Upper back
35 pts
Abs and core
35 pts

Effort and your quota

8/10 effort8.3fatigue per set

Your quota per set: 10 reps at 16 kg each hand, stopping 2 reps short of failure.

One hard set earns 182 legs points, 110 push points, 35 pull points, 46 arms points, 35 core points.

Prime movers

Quadriceps, gluteus maximus, deltoids, triceps, upper back, abdominals.

What to look for

  • Elbows stay on the ribs in the squat.
  • Drive up and let the legs start the press.
  • Lock out tall, ribs down.
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.