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Donahue, C. T. (2018). Static line parachuting techniques and training (TC 3 - 21.220). Washington, DC: Department of the Army. Retrieved from http://www.benning.army.mil/infantry/rtb/1-507th/content/pdf/TC%203-21.220,%20Parachutes%2021%20Dec%202017.pdf

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Hildenbrandt, K. J., & Vasavada, A. N. (2013). Collegiate and high school athlete neck strength in neutral and rotated postures. Journal of Strength and Conditioning Research, 27(11), 3173-3182.

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EXERCISE IMAGES

HEP2go. (n.d.). Exercise editor. Retrieved from https://www.hep2go.com/print_card.php?userRef=iekcjgihhcmg