Right, this isn't a case of "what exercise is best" but of what exercise does what? I am a fairly active guy, I go for fairly long wood/road runs, cycle frequently and use free weights. I try to go swimming once a week but it's tricky without drinking 12 litres of toddler pee. But it got me thinking, what good does each type of exercise do? Gov' guidelines suggest 3 sessions of fizz for 20mins or more duration every week, I do more than this, but lacking any professional (and not wanting to pay ridiculous amounts of money for a proper gym membership) guidance I'm unsure where to turn to. I'm aware that any aerobic exercise (running, cycling, swimming) is good for the heart and general health - but why? Are there any benefits of combining running with cycling? As in day 1: 8 mile run, day 2: 18 k on the bike, day 3: 8 mile run... etc Is it better to go on a few heavy runs per week, or shorter runs everyday? I dont have a 9-5 job, I'm an odd job man - but it can be tricky to find a couple of hours to pound the streets. I've spoken to my doctor, the human muscle down the gym and a rugby coach but I can't seem to get a definitive answer to any of the above that I fully understood. Any replies would be gratefully recieved!