Bent leg jackknife The bent leg jackknife fully engages the abdominal muscles and helps to strengthen and tighten the core. This exercise also challenges... | By On Time Kickboxing | Facebook
![woman doing bent leg jackknife exercise flat vector illustration isolated on white background vector de Stock | Adobe Stock woman doing bent leg jackknife exercise flat vector illustration isolated on white background vector de Stock | Adobe Stock](https://as2.ftcdn.net/v2/jpg/04/30/15/87/1000_F_430158752_a76Fun9xqCfWPHBFbmPiO9lpjXckGSHg.jpg)
woman doing bent leg jackknife exercise flat vector illustration isolated on white background vector de Stock | Adobe Stock
![Hardcore Hard Core Workout! Get Ready for Ripped Abs. You Won't Believe These Results... - Transform Fitspo Hardcore Hard Core Workout! Get Ready for Ripped Abs. You Won't Believe These Results... - Transform Fitspo](https://transformfitspo.com/wp-content/uploads/2017/04/weighted-bent-leg-jackknifes-300x227.jpg)
Hardcore Hard Core Workout! Get Ready for Ripped Abs. You Won't Believe These Results... - Transform Fitspo
Circuit 1, Exercise 2: Bent-Leg Jackknife | Kelsey Wells Is Teaching You How to Get a Stronger Core With This Equipment-Free Ab Workout | POPSUGAR Fitness Photo 5
![Jackknife Exercise Stock Illustrations – 26 Jackknife Exercise Stock Illustrations, Vectors & Clipart - Dreamstime Jackknife Exercise Stock Illustrations – 26 Jackknife Exercise Stock Illustrations, Vectors & Clipart - Dreamstime](https://thumbs.dreamstime.com/z/woman-doing-toe-touches-jackknife-sit-ups-woman-doing-toe-touches-jackknife-sit-ups-crunches-exercise-flat-vector-illustration-236723296.jpg)