Mu uncle is a nice enough guy but also a fat bastard. He decided the veins in his lower legs popping open and squirting blood was maybe a sign of maybe do something about the weight as the doctors keep telling him. So he went on the weekly cycling thing with some relatives, me included.  We do about 40km/h average, not Tour de France 52km/h average, but with the distances we do it does demand a bit of stamina. Also some up and down included. We warned him, he was confident he could show us some things. About 1/4 in, say ~30 minutes, he already goes "Phew lad, quite a ride, when we get home in a minute we better take care of our fluids." Hehehe, we go left here, he was like "Oh....". He was trying to stay in front, but could no longer, he turned redder and redder, he started falling behind, told us to keep pace, he'd catch up in a minute. We decided to just go slower and cut it short at just over an hour. Then we get home, and he brags about how he could keep up while still out of breath unlike us, how he stayed with the group the whole way, we just let him. He did squeeze in there he fell behind a little while because the gears on his bicycle were wrong for the type of route, and that his bigger body caught more wind downhill, and the tires were a bit off in pressure, etc. First thing he did was drink a full bottle of Pepsi Green (it is healthier guize, srsly) and eat a bigass sandwich. He never went along again. I do not think he liked it too much. Doctor gave him peepills to aid in losing the fluid. Easier I guess.