On Monday I wrote a blog and talked about this exercise a little. https://www.youtube.com/watch?v=c7ot5i9u_mM
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This is a great ab exercise for everyone but particularly if you have back issues. Laying on the floor supports the back and since only the leg is moving the spine is stable.
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This exercise is harder than it looks. You may need to start by bringing the knee to the chest instead of lifting the whole leg. If shown version isn't too tough, try using a smaller ball. Just make sure to keep your entire back flat on the floor. Begin with 3 sets of 10 repetitions.
