The split jack, sometimes called as the split jumping jack, is a form of a warmup exercise and may be regarded as a variation of the traditional jumping jack.[1][2][3] It is similar to the split jump; however, in the latter, the arms do not move and stay stationary at the sides of the torso.
- ^ Campbell, Adam. The Men's Health Big Book of Exercises, Warmup Exercises, Chapter 12, Rodale, New York, 2009, page 353.
- ^ Campbell, Adam. The Women's Health Big Book of Exercises, Warmup Exercises, Chapter 12, Rodale, New York, 2009, page 353.
- ^ SPLIT JACKS, MH Celebrity Fitness, menshealth.com