and interval workouts. Begin with a 20-minute run and gradually build up to 40 minutes. Then start this plan.You've got...20 minutesYou should: Run hill repeatsThe strength required to run on inclines builds calorie-hungry muscle as much as hitting the weights

's not good for the long term. If you lose a pound a week you can keep that weight loss going, whereas if you're losing three or four pounds, the weight  will probably go back on."Do this instead: Only weigh yourself once a week. Look for long-term trends

. GGWell, sure, it's not impossible. But a person who is overweight would be faster if he lost weight. Theoretically, a loss of about two pounds will increase speed by about a metre per minute of running. So if a runner runs a 5K in 20 minutes, a two

's not impossible. But a person who is overweight would be faster if he lost weight. Theoretically, a loss of about two pounds will increase speed by about a metre per minute of running. So if a runner runs a 5K in 20 minutes, a two-pound weight loss would make him