b- Importance of hip flexibility
References
Delavier, F., & Gundill, M. (n.d.). Mixed Martial Arts Anatomy. Human Kinetics.
Isacowitz, R. (2014). Pilates.
Pilates, J. (n.d.). Return to Life through Contrology.
Rael Isacowitz, K. C. (n.d.). Pilates Anatomy.