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 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

. 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