I'm heavy. Heavy enough that any extended exercise that involves running around will eventually result in foot and ankle problems. My estimate is that I need to lose 94 pounds. I am about 280 pounds. Through my twenties I was under 200 pounds, and my best endurance results were achieved when I was in the 180's. For the record, I'm 6'4". So 186 is the goal. That would give me a BMI of 22 which according to several esteemed Internet sources is the optimal BMI for staying healthy.
Despite the foot and ankle discomfort I mentioned I have begun to increase the physical activity; a run on Thursday, bike ride on Saturday, and another run on Sunday. I am slow, and the distance is laughable when compared to the goal, but it is a beginning. I have a tendency to overtrain when I set a goal for myself, ignoring my body's warnings to slow down, recover, sleep. With age I know I have lost some ability, but I hope to have gained some wisdom. Yesterday I took a nap in the afternoon. For me that is unheard of so maybe it is a sign of wisdom. We'll see.