The One Easiest Way to Tighten Your Abs
The jackknife is one of my favorite ab exercises. Not only does it target lower and upper abs, but it also helps strengthen your lower back. The move also creates stability training to develop an overall tighter and stronger core.
How it works: Perform as many jackknife situps as you can in 30 seconds. Rest for 30 seconds and max out again. Keep doing this until you’ve completed five rounds. Perform this workout five times a week.
After two weeks of ab tightening, add a medicine ball to your workout. Since jackknifes are a single fluid motion, you can easily add weighted resistance. As your abs get stronger, you’ll be able to add more weight and see better results. All muscle groups need resistance to grow, so don’t avoid giving a little extra burn to your abs and core.
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