Bound left
Side view
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Lateral bound

Skater jump

Take care: High impact on one leg: leave it out in pregnancy and postpartum.

Skater jumps: from the right leg, bound sideways to land on the left leg, the right foot swinging behind and off the floor, the trunk leaning forward; then bound back. Momentum is not modelled, so there is no balance check.

29°Ankle dorsiflexion
66°Knee flexion
69°Hip flexion
32°Trunk from vertical
51°Arm to trunk
25°Elbow flexion
18Ankle spacing, cm
57Hand 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

Glutes
100 pts
Quads
82 pts
Adductors
64 pts
Calves and shins
46 pts

Effort and your quota

7.5/10 effort7.5fatigue per set

Your quota per set: 14 reps at bodyweight, stopping 2 reps short of failure.

One hard set earns 278 legs points.

Prime movers

Gluteus medius and maximus, quadriceps, adductors, calves.

What to look for

  • Push off the outside foot and jump sideways.
  • Land on one foot, knee over the toes, and hold.
  • Swing the arms across to help the jump.
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.