Pull and extendCentre of mass inside base of support
Side view
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Snatch pull

The snatch without the catch: 70 kg on a snatch grip pulled from the floor, then an explosive extension onto the toes with straight arms. Builds the snatch pull with more weight than you can snatch.

13°Ankle dorsiflexion
82°Knee flexion
142°Hip flexion
75°Trunk from vertical
74°Arm to trunk
0°Elbow flexion
32Ankle spacing, cm
110Hand spacing, cm
2Knee outside ankle, cm
0°Knee cave, ° inside toe line
50 / 50Load left / right, %
0Pelvis drop, cm

Load and joint demand

Load in the model: 70 kg. Balance and joint demand re-solve as you change it.

Lower back
408 / 408
Hip extensors
246 / 246
Knee flexors
13 / 49
Calves
53 / 53
Shoulder, per side
131 / 133
Elbow, per side
64 / 64

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
Hamstrings
82 pts
Quads
64 pts
Upper back
46 pts
Calves and shins
35 pts

Effort and your quota

9/10 effort9.4fatigue per set

Your quota per set: 10 reps at 70 kg, stopping 2 reps short of failure.

One hard set earns 271 legs points, 46 pull points.

Prime movers

Gluteus maximus, hamstrings, quadriceps, trapezius, upper back, calves.

What to look for

  • Same start as your snatch: hips low, chest up.
  • Bar meets the hips at the top, arms long.
  • Finish tall on the toes.
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.