You don't need an expensive gym or fancy, overpriced equipment to work out your glutes (that large and important muscle group that is basically your butt). The simple exercises here will do the job. For each one, do at least two sets of 10 reps. To make any of the exercises more difficult, add free weights in each hand. (If you don't have weights, canned goods work too.) You can also add a three- to five-second hold to any move to increase the difficulty.