Hip Flexor Strain Exercises: References

Tyler, Timothy F., Takumi Fukunaga, and Joshua Gellert. "Rehabilitation of soft tissue injuries of the hip and pelvis." International journal of sports physical therapy 9.6 (2014): 785.

Selkowitz DM, Beneck GJ, Powers CM. Which exercises target the gluteal muscles while minimizing activation of the tensor fascia lata? Electromyographic assessment using fine-wire electrodes.J Orthop Sports Phys Ther. 2013 Feb;43(2):54-64. doi: 10.2519/jospt.2013.4116.