If you're dragging through your workout, you may be exercising too hard. It's easy to work your body too intensely, especially during the summer months, when heat cramps and heat stroke can plague athletes.

To keep within your target range, try wearing a heart-rate monitor or exercising on a machine that tracks heart rate. Here's another fit tip: If you find that you're cramping up during workouts, you may be low in potassium. Try adding more to your diet with potassium-rich foods like bananas, potatoes and fig bars.

Optimize your training sessions with a heart rate monitor. Find out why they're so beneficial and learn how to calculate your target training zone. Plus, get smart about summer exercise.

You can get more exercise tips and keep your own fitness diary when you join the FoodFit Plan, our healthy lifestyle program for lasting weight loss. You'll eat great and slim down this summer!