The most secretive body parts are muscles, which hide behind layers of skin and appear only occasionally to help lift cars off trapped kittens. Flex your biceps in the absence of a cat emergency with today's Groupon: for $39, you get one month of unlimited membership to either CrossFit Oshawa or CrossFit Whitby. CrossFit is a general strength and conditioning program that is based on an inclusive set of movements and exercises with the level of difficulty determined by the participant's fitness level. This impartial program is used by military units, elite athletes, fitness enthusiasts, and first-time muscle moulders alike. Each sweat-inducing session includes a warm-up, skill session, and workout, and is led by a certified CrossFit instructor that works with students individually to find the right level of intensity and jazz hands for the most effective workout. Like Mother Schwarzenegger's house, both CrossFit locations also offer nutritional consultation and personal-training options. Check out the Whitby and Oshawa class schedules to find a time that’s right for you.