In the Southwest, the cooler weather usually doesn't set in until October, which gives you plenty of time to continue soaking up the great outdoors as summer fades into fall. Instead of driving to the gym, try adding cycling into your exercise regimen. It's a great low-impact option that tones your lower body and also torches calories at the same time.

When you're short on time, turn your ride into an interval workout instead of racking up your mileage. Sweets recommends biking for five minutes to warm up, then start adding short bursts of intense sprints followed by two minutes of recovery; i.e., 30 seconds, 45 seconds, 60 seconds, 75 seconds, 90 seconds; then work your way back down the ladder.