MTN OPS YETI PREWORKOUT WATERMELON TRAIL PACKS 20 CT. YETI was formulated to deliver explosive training results and provide smooth, non-jittery performance for the athlete that trains year around. With industry leading blend of Amino Acids L-Arginine and L-Citrulline, coupled with the proper measurements of L-Glutamine, Creatine Monohydrate, Beta-Alanine, YETI may provide sustained energy and performance, helping you take your training from routine, to extreme.