Press, concentricBalanced over midfoot
Side view
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Kettlebell press

Standing, one 16 kg bell pressed strictly from the rack to lockout with the right arm; no knee dip. The bell turns from the outside of the forearm to behind it as the arm straightens, and the hips shift to keep the load centred.

2°Ankle dorsiflexion
2°Knee flexion
7°Hip flexion
2°Trunk from vertical
26°Arm to trunk
146°Elbow flexion
32Ankle spacing, cm
43Hand spacing, cm
-5Knee outside ankle, cm
–Knee cave, ° inside toe line
50 / 50Load left / right, %
-1Pelvis drop, cm

Load and joint demand

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

Lower back
40 / 40
Hip extensors
21 / 21
Knee flexors
25 / 25
Calves
34 / 34

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

Shoulders
100 pts
Triceps
82 pts
Upper back
64 pts
Abs and core
46 pts
Glutes
17 pts

Effort and your quota

4.5/10 effort4.7fatigue per set

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

One hard set earns 17 legs points, 182 push points, 64 pull points, 82 arms points, 46 core points.

Prime movers

Anterior and lateral deltoid, triceps, upper trapezius, obliques, gluteus maximus (holding).

What to look for

  • Squeeze the glutes and the fist before you press.
  • Press up and slightly out, then lock out by the ear.
  • Pull it back down to the rack under control.
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.