minutes.You've got...30 minutesYou should: Run intervalsRunning fast burns more calories per minute than slow running, says Shah.Here's how Sprint for 20 seconds, then jog for 10 seconds. Repeat four to eight times. Walk for one minute. Repeat the sprint/jog/walk

the run portion of these workouts, for every two minutes of hard effort, beginners should walk for one minute, gradually increasing the length of the hard efforts.You've got...20 minutesYou should: Perform an 'envelope run'This drill run builds

Tempo workouts, speedwork, long runs, not to mention work, family and life in general... how can a runner fit it all in? One time-efficient solution: combo workouts, which blend elements of quality runs to make the most of every minute you have

neuromuscular ability to produce force and power, which can improve your running economy and help delay muscle fatigue."Here's how Run 100m all out then walk for three minutes until you have recovered and caught your breath. Repeat three times. Start and end