By
eHow Sports & Fitness Editor
Difficulty: Moderately Easy
Step1
Listen to your body. If you feel bored by your workout and you're not noticing any difference, change your routine. How often and for long depends entirely on you.
Step2
Switch between the treadmill and the stationary bike. Both focus on your lower body, but use different muscles.
Step3
Forgo the bench press for some dumbbells instead. It's a simple change but one that will have a tremendous impact on your chest muscles.
Step4
Follow a technique called periodization. This is when you manipulate timing, intensity and volume. You'd lift lightweights for a high number of repetitions for 2 months. This improves your muscle tone. Then, switch to heavier weights with few reps for 2 months. This builds your strength. Finally, take a month off before starting the cycle over again.
Step5
Add some exercise classes to your routine. You'll be introduced to an entirely new type of exercise and you'll be working your muscles in different ways.
Step6
Alternate between indoor and outdoor exercise. Go for a walk with a friend a few days a week. The other days, hit the gym.