I hope this helps:
What is the best way to increase stamina?
Slowly.
I was 45 when I did my first triathlon (from your other question). That was in 1982 when the sport was still shiny new. I'd been riding a bike for about three years, running for about two, but I had to learn to swim. Because I hadn't rushed to get into triathlon it was fairly straightforward.
The trick is to learn how to pace yourself. No matter how much energy you burn up in the water you'll have all you need for the bike. Getting into the run is a bit comical at first because your feet have been turning circles and now you need them to assume a forward motion. After you've done one or two you'll learn to trust them, even if they do seem to have a mind of their own.
As for your diabetes, I think it's wonderful that you're taking on such a gruelling sport in spite of your illness. The only thing I can say that might help is that you can keep eating (a little) during the cycle and run legs. For the rest you must consult a physician.
- Reduce recovery time and resistance
- Cutting your recovery time and pushing yourself during a workout are great steps toward having more stamina, but don't forget that your body still deserves some R&R.
- Ratchet up intensity
- Remember 'frequency + duration'
Exercise. The Bible acknowledges that “exercise is good for your body.” (1 Timothy 4:8, Contemporary English Version) It can strengthen your muscles and bones, improve your stamina, control your weight, increase your mental capabilities, boost your immunity, alleviate stress, and lift your mood. Of course, exercise can also be fun, since it can include activities you enjoy!