Press, concentric
Side view
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Half-kneeling kettlebell press

Kneeling on the left knee with the right foot forward, one 16 kg bell pressed from the left-hand rack to lockout. The kneeling stance takes the legs and the lower-back arch out of it.

0°Ankle dorsiflexion
92°Knee flexion
92°Hip flexion
0°Trunk from vertical
35°Arm to trunk
65°Elbow flexion
20Ankle spacing, cm
25Hand spacing, cm
1Knee outside ankle, cm
–Knee cave, ° inside toe line
–Load left / right, %
0Pelvis drop, cm

Load and joint demand

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

Shoulder, per side
39 / 39
Elbow, per side
28 / 28

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
Abs and core
64 pts
Glutes
23 pts

Effort and your quota

4/10 effort4.2fatigue per set

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

One hard set earns 23 legs points, 182 push points, 82 arms points, 64 core points.

Prime movers

Anterior and lateral deltoid, triceps, obliques, gluteus maximus of the kneeling leg (holding).

What to look for

  • Squeeze the glute of the down knee.
  • Ribs down, press up by the ear.
  • Pad the knee.
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.