'Jack-knives are a super-efficient exercise combining leg lifts and crunches. I started with one set of 10 repetitions and built up to seven sets of 30 on workout days. (But I\'m pretty sure you don\'t want to watch a boring video of 210 reps with breaks in-between!) I\'m on my 8th month of using Wii Fit regularly. Haven\'t had much back soreness since starting jack-knives for \"core\" training, so it\'s helped a lot. (^_^)d Watching the trainer gets hypnotic after a while, since she\'s doing the maximum 30 reps in this set...'
Tags: abs , exercise , fit , wii , jackknife , Jackknives , jack-knife , jack-knives
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