Even the most avid gym-rat sometimes flags. This may be because of boredom or a lack of results. Here are some ideas on how to inject life back into your routine.
Is the heavy bag any good?
Plenty of blokes pummel away, pretending they're Brad Pitt in Fight Club, but using a punchbag can be punishing cardiovascular workout. Get yourself some gloves and stand with your feet shoulder-width apart. Stand diagonally to the bag, left foot forward if you're left-handed. Your hand should face downward when it connects. Pretend to be punching through the bag. Try punching vigorously for three minutes and resting one minute. Do that for 20 minutes. Or try five 60-second sessions with no more than a minute's break in between each session.