I founded Flexia to bring the Pilates studio experience into your living room through a beautiful machine called a Reformer and an online streaming platform of classes. I believe Pilates on a Reformer is a powerful fitness tool and it needs to be accessible at home.
If your lower back arches off of the floor during the exercise, you're likely putting excess stress on the area. If that happens, try modifying the exercise. You can raise your legs higher, only lift one leg off the floor at a time or try bent-leg reps.
The flutter kicks ab exercise targets your six-pack and core muscles, hip flexors and quads. Here's how to do, modify and progress them to build your lower abs.