Abdominal Muscle Strain Exercises: References

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Ratamass N. ACSM's Foundations of Strength Training and Conditioning. Philadelphia, Pa.: Wolters Kluwer Health Lippincott Williams & Wilkins; 2012:253.

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Tayashiki K, Takai Y, Maeo S, Kanehisa H. Intra-abdominal Pressure and Trunk Muscular Activities during Abdominal Bracing and Hollowing. International Journal of Sports Medicine. 2015;37(02):134-143. doi:10.1055/s-0035-1559771.