FlexHigh Knees
Muscles worked
- Iliopsoas
- Rectus Femoris
- Gastrocnemius
- Rectus Abdominis
- CategoryCardio
- Default target3 sets × 30 seconds
- EquipmentBodyweight
- Movement patternCardio
- Training stylesHIIT
Technique
Setup
Stand tall with feet hip-width apart, arms bent as if running.
Movement
Run in place, driving each knee up to hip height, pumping your arms and staying on the balls of your feet.
Form Tip
Stay tall — do not lean back to lift the knees higher.
Increase Difficulty
Speed up or raise the knees above hip height.
Decrease Difficulty
March in place, lifting the knees without the jump.
Hear the cue
The trainer's spoken setup and form tip for this exercise — the same clips Flex plays in a session.