Cyle Brewer, a member of the Copperas Cove Special Weapons and Tactics team, pushes himself during the TRX training circuit at the Applied Functional Fitness Center at Fort Hood, Texas, Dec. 16, 2015.
The modern-day gym floor is littered with hulking, intricate, alien-looking contraptions that can confuse and/or intimidate even the most diligent Pumping Iron–type wannabes. (Take the Skillmill ...
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