http://AskTheTrainer.com/lunge-exercise.html Personal Trainer Mike Behnken, MS, CSCS Lunges are by far the best legs and butt exercise as the injury potential is far less than squats. With lunges you can include upper body exercises to work a large percentage of your total body muscle mass and coordination. Top 10 Reasons to Include Lunges in Your Workout Program 10. Elevate your Metabolism 9. Help Improve your Balance 8. Increase Strength of Legs and Glutes 7. Save you Time 6. Allow you to Work your Upper and Lower Body Simultaneously. 5. Safe and Effective Low Injury Potential. 4. Take up Very Little Space 3. Functional Strength 2. Largest Muscle Mass Worked 1. They Work http://AskTheTrainer.com