AP Photo: Avoid injury with proper form.
While the overall benefits of regular exercise have been proven, it's not without its negative sides. Many types of exercise have the tendency to result in a minor injury or two now and again, especially when they are not correctly (with stretching before and after, and proper form).
A very common problem for long distance runners, foot blisters can show up from many other types of exercise, but particularly cardiovascular activities like dance or other high-impact aerobics. While they aren't a serious injury, it's certainly something that most would like to avoid altogether, if not heal very quickly. In order to prevent foot blisters, the most important thing you can do is to make sure that your shoes are the right size for your feet. In order to find that shoe that fits, check out this artcle, from Homeexercisecoach.com. If you already have blisters, the best way to deal is to pop it, apply an antibiotic or antiseptic, and cover it with a Band-aid.
This injury is particular common among swimmers and weight-lifters, but it can result from a variety of different types of exercise. In order to prevent shoulder pain, it's important to maintain good posture, exercise proper form, and allow rest days in between strength and swimming workouts (for swimming, at least one rest day per week should suffice, while weight-training should be done every other day the most). To treat a shoulder injury, it's a good idea to go with the R.I.C.E.R. regime (Rest, Ice, Compression, Elevation, and Referral) for the first step. After 2-3 days of ice and compression, it will be time to switch to heat.
Most commonly caused from tennis (hence the term "tennis elbow") and golf, an elbow inury is usually the result of either improper form or overuse. While it's more important to ensure rest periods between games, it's important to remember to keep your wrist in a neutral position as much as possible when playing either of these sports. To treat an elbow injury, your best bet is some serious rest time (at least three days, though a week would be preferable), ice, and the addition of a strength-training plan to your routines (moves focusing on the wrists and forearms would be best).