This variation relies more on the hip flexors and deeper core muscles for stabilization and to help raise the leg as you move ...
The exercise is a variation of an ab crunch, where one leg flexes while the other extends. At the same time, there is rotation at the lumbar spine. ‘This creates a challenge for the core as ...
Just five more seconds, guys. One more. All right, now we're going to go on to the vertical leg crunch. Same position, but with your legs in the air. Just crunch up nice and slow. Remember ...
although crunches on an exercise ball generated less activity in the obliques and rectus abdominals than some of the other ab exercises on the list, as it generated less activity in the leg ...