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Burpee

From standing: squat and put the hands down, jump the feet back to a plank, lower the chest to the floor, push back up, jump the feet in and jump up with the arms overhead.

4°Ankle dorsiflexion
2°Knee flexion
3°Hip flexion
4°Trunk from vertical
19°Arm to trunk
2°Elbow flexion
22Ankle spacing, cm
58Hand spacing, cm
-1Knee outside ankle, cm
–Knee cave, ° inside toe line
–Load left / right, %
0Pelvis drop, cm

Load and joint demand

Bodyweight exercise: the load slider has no effect here; body mass comes from your limits.

No gravity-based joint demand to show for this exercise.

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

Quads
100 pts
Glutes
82 pts
Chest
64 pts
Triceps
46 pts
Shoulders
35 pts
Abs and core
35 pts

Effort and your quota

8/10 effort8fatigue per set

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

One hard set earns 182 legs points, 145 push points, 46 arms points, 35 core points.

Prime movers

Quadriceps, gluteus maximus, pectoralis major, triceps, anterior deltoid, abdominals.

What to look for

  • Hands down close to the feet, then jump back into a straight plank.
  • Chest all the way to the floor.
  • Feet land flat beside the hands, then jump and clap overhead.
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.