Originally Posted by
Mithrandir
I wouldn't try to push yourself to try to stand and pedal. After over 3000 miles I still can't do it. I'm almost certain it's my weight.
Just keep cycling, it'll get more comfortable as your body adapts. And even moreso as you lose more weight.
This is an aside to the discussion, but it's not just Clydes who aren't able to pedal standing up. I've ridden with a guy who had knee replacements and he was told by his doctors standing and pedaling wasn't a good idea for his hardware. The rider was in his late 50s and couldn't have been more than 150-160 sopping wet. Adventure Cycling mentioned such a rider a couple of years ago as well, although there was another medical reason for his constantly sitting when riding.
In my case, I can stand and coast. But I don't like the 'give' in my pedal extenders, and I'm not the most structurally sound guy anyway.