Only legs raise — trunk doesn't crunch
Hip flexors do all the work; rectus abdominis disengages.
Overactive muscles
Hip flexorsErector spinae
Corrective work
Foam RollHip flexors↗StretchHalf-kneeling hip flexor stretch↗Core · Core
V-Up
Coaching cues
- Start supine — arms overhead, legs extended
- Simultaneously raise legs and torso; reach hands to feet
- Peak: a balanced V-shape — touch toes if possible
- Lower under control — don't slam the floor
Common faults 2
Knees bend significantly
Reduces lever arm; makes the movement easier — hamstrings too tight.
Overactive muscles
Hamstrings
Corrective work
Foam RollHamstrings↗StretchHamstring stretch with strap↗