@The Rumon
A fantastic athlete with truly remarkable achievements and a true inspiration to all diabetics, showing what is possible even with diabetes.
Remember reading how Steve Redgrave had to go on insulin in order to cope with the huge carb intake that the energy needs of his very intensive training demanded.
Increasing muscle mass and reducing fat is known to improve long term insulin resistance for T2 diabetics, so highly advisable.
While exercise generally has the added benefit of burning up glucose for energy and therefore lowering blood glucose levels, short burst high intensity exercise such as weight lifting is known to elevate glucose through the action of stress "fight or flight" hormones that suppress insulin.
Exercising and body building is possible but you will need to monitor your levels closely during long exercise sessions to avoid highs or lows.
I believe we have members on this forum who have run marathons so I am sure that plenty of help will be available.
I am sure I have seen a recent post from a bodybuilder as well. If I remember correctly he was describing something called carb loading but I do not remember the details. I think it was something about eating low carb four out of five days but then having a really high carb diet day to replenish resources.
My very limited understanding on diets and sports is that a low carb high fat diet leading to ketosis may actually offer advantages over a high carb diet in endurance sports, while the opposite is true in more explosive sports ( glucose apparently can provide energy at a faster rate than fatty acids/ ketones).
As with most things to do with diabetes I suspect the best way forward is to try it and see if it works for you, but I certainly can not see why it should not.
Pavlos