In a nutshell, you lie on your back with bent knees and bring your knees toward your chest as you crunch your torso up to meet them . The double crunch is an effective way to contract the entire length of your abdominal muscles and hip flexors with a single exercise.8 Şub 2021
What is a double crunch?
In a nutshell, you lie on your back with bent knees and bring your knees toward your chest as you crunch your torso up to meet them . The double crunch is an effective way to contract the entire length of your abdominal muscles and hip flexors with a single exercise.8 Şub 2021