I train in central park twice a week and I feel fine after 3 or 4 laps (6 miles per lap) but everytime I do longish rides my WHOLE body would just complain. It's only in the last 4 months or so when I can really do 50+ miles without taking long breaks and feeling I will collapse at any moment or die from hunger.

There are definitely more hills in my recent rides and I have been trying to increase my speed and distance so i don't know if these are the contributing factors to the uncomfortableness I feel after the long rides.

So you guys don't get sore after a long hard ride? (yes, 50+ is long for me).