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A company car mail order tretinoin Stewart has similar recommendations, suggesting that participants engage in plyometric training – motions meant to stretch and shorten a muscle quickly – to prepare for obstacles that focus on more than just "lungs and legs." He recommends jumping and bounding actions to mimic obstacles that require dynamic movement. And simple exercises can fit the training bill, Kimbel adds. Exercises that use a person's body weight as leverage – such as push-ups, pull-ups and lunges – prepare participants for the rigors of the course and don't require a gym or trainer.