Abs, Core
Obliques, Hip Flexors
Watch Tutorial
https://www.youtube.com/shorts/JIREM9nUnNU
https://www.youtube.com/shorts/ePRsSOTA63Y
https://www.youtube.com/shorts/mraOtxEYxDs
https://www.youtube.com/shorts/SAWsNjkcSWc
https://www.youtube.com/shorts/822DoJZUJk4
https://www.youtube.com/shorts/MNzNeH--Pgs
Lie flat back, arms sides.
Legs extended or knees bent.
Engage core.
Lift head/shoulders off floor.
Simultaneously bring knees towards chest.
Crunch into ball.
Lower slowly.
Repeat.