Pull, concentricBalanced over midfoot, bar 6.1 cm ahead
Side view
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Sumo deadlift

Wide stance with 40° toe-out, hands inside the knees. The wide stance shortens the effective thigh in the side view, so the solved trunk starts a little more upright than conventional and the bar travels less far.

-7°Ankle dorsiflexion
57°Knee flexion
118°Hip flexion
67°Trunk from vertical
66°Arm to trunk
0°Elbow flexion
76Ankle spacing, cm
36Hand 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: 140 kg. Balance and joint demand re-solve as you change it.

Lower back
676 / 676
Hip extensors
397 / 397
Knee flexors
99 / 99
Calves
62 / 62
Shoulder, per side
16 / 16

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
Lower back
35 pts

Effort and your quota

9.5/10 effort9.9fatigue per set

Your quota per set: 10 reps at 140 kg, stopping 2 reps short of failure.

One hard set earns 292 legs points, 35 core points.

Prime movers

Gluteus maximus, adductors, quadriceps, hamstrings, spinal erectors.

What to look for

  • Knees push out over the toes; the top camera shows how far.
  • Shorter bar travel than conventional because the hips start closer to the bar.
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.