You might take a look at HIIT (High Intensity Interval Training). I started doing it two months ago and I think it is well worth the effort. Although it takes h

You might take a look at HIIT (High Intensity Interval Training). I started doing it two months ago and I think it is well worth the effort. Although it takes half an hour but it has a long lasting metabolic speedup effect and a little euphoric feeling which keeps you doing it: http://en.wikipedia.org/wiki/High-intensity_interval_training http://en.wikipedia.org/wiki/High-intensity_interval_trainin... I usually do 3 workouts a week. It consists of a 5 minute warmup followed by eight 1 minute sprints with 2 minute walk intervals and an 5 minute cooldown at the end: 5+(8*3)+5: 34 minutes total. As others have said there is no point in "hacking" your workouts. You can do away with optimizations like HIIT, but imho you still need around 1 hour of exercise every day to keep yourself healthy.