I've signed up to do a try-a-tri in June, consisting of - 250m open water swim, 20km bike, and 3km run.
Am already a fairly consistent swimmer - doing 30x lengths (750m, mixed strokes) in local pool 3-4 times a week. I can ride a bike, but have never done so competitively, and am pretty clueless about gears, style, technique etc. Running-wise, I did a couch to 5k a couple of years ago, but had to jack in running due to knee and achilles problem.
On that last point, I should add that I'm a very big guy - 21.5 stone/6ft 3ins tall - and am using this triathlon as a motivator to lose weight. My physio told me that I shouldn't be running at the weight I'm at, as it is having a bad impact on my joints - rather, I should lose more weight BEFORE I start running.
The problem is, all the training plans I've seen insist you do all three disciplines from the off. But am I better just training in swimming and bike for a couple of months and then starting running once I have a bit more weight off/am a bit fitter? Or MUST I train in all three from the very beginning?
Would appreciate any thoughts on this - it's been a real goal of mine to do a triathlon, so I am feeling very motivated.
My advice would be to set a treadmill at a 2 percent incline and walk 3K to start with. That will get your heart rate up and reduce impact on your joints. Ultimately, the triathlon that you're going to do is aimed at beginners so you won't be alone in being a bit apprehensive about the bike gears, the swim distance etc etc. I did the Dublin 70.3 a few years ago and there was a bloke who must have been 30 stone walking around the run course, but he was getting the biggest cheers from the crowd because he was determined to finish and clearly had the courage to enter in the first place. Good luck on your journey to being awesome.