Only have 30 minutes to workout today?  Try an interval workout! Get on the treadmill, then stepper, bike, and then back on the treadmill for five minutes each.  After each five minute segment complete 15 pull-ups, 15 dips, 15 push-ups, and 15 squats. You’ll reduce your risk of heart attack, lower your blood pressure, and be in a better mood.  Try this two to three times a week and your body will become more efficient.  You’ll have greater stamina for more enjoyable activities that also work up a sweat.