PullBalanced over midfoot
Side view
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Kettlebell sumo deadlift

A 32 kg bell between the feet in a wide stance with the toes turned out; the handle is held with both hands inside the knees and the hips sit lower than in the narrow-stance pull.

-1°Ankle dorsiflexion
57°Knee flexion
112°Hip flexion
65°Trunk from vertical
65°Arm to trunk
0°Elbow flexion
72Ankle spacing, cm
10Hand spacing, cm
-4Knee outside ankle, cm
0°Knee cave, ° inside toe line
50 / 50Load left / right, %
0Pelvis drop, cm

Load and joint demand

Load in the model: 32 kg. Balance and joint demand re-solve as you change it.

Lower back
254 / 254
Hip extensors
156 / 156
Knee flexors
22 / 39
Calves
33 / 33
Shoulder, per side
47 / 47
Elbow, per side
23 / 23

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

Glutes
100 pts
Adductors
82 pts
Quads
64 pts
Hamstrings
46 pts

Effort and your quota

7.5/10 effort7.8fatigue per set

Your quota per set: 10 reps at 32.5 kg, stopping 2 reps short of failure.

One hard set earns 292 legs points.

Prime movers

Gluteus maximus, adductors, quadriceps, hamstrings.

What to look for

  • Knees push out over the toes.
  • Bell stays under the hips.
  • Stand tall, squeeze the glutes.
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.