single-leg jackknife is a calisthenics and pilates exercise that primarily targets the abs and to a lesser degree also targets the hamstrings, hip flexors and lower back ...more
single-leg jackknife is a calisthenics and pilates exercise that primarily targets the abs and to a lesser degree also targets the hamstrings, hip flexors and lower back.
Learning proper single-leg jackknife form is easy with the step by step single-leg jackknife instructions, single-leg jackknife tips, and the instructional single-leg jackknife technique video on this page. single-leg jackknife is a exercise for those with a intermediate level of physical fitness and exercise experience. Watch the single-leg jackknife video, learn how to do the single-leg jackknife, and then be sure and browse through the single-leg jackknife workouts on our workout plans page!
