Exercise demonstration of the jack knife exercise with a stability ball. ... <看更多>

http://www.gbpersonaltraining.com/ swiss - ball - jack-knife -exercise/ visit GB Personal Training to see more exercises and movements on the ... ... <看更多>

Exercise of the Week Stability Ball Jackknife Muscles Used: Abs, Obliques, and Hip Flexors➡️3 sets of 10-15 reps✓Brace your core ... ... <看更多>

Dec 16, 2011 - stability ball, jack knife exercise, core. ... <看更多>

Are you performing the stability ball jackknife with good form? Get tips on this exercise and 100 others with step-by-step instructions in Exercise... ... <看更多>