... advanced in age, that is!
I am incredibly irritated by my 66 year old body. Fairly basic stuff like a two mile run and a weights session inflict unacceptable damage to my joints. Twinges in my knees and soreness in my elbows and tendons.
The only benign exercise is cycling, but I'm not a fan of road cycling - too many cars for my poor bike-handling skills, especially on steep uphill sections. Conversely, lengthy exercise-bike sessions are just too boring.
I am mostly at a loss. I will ration road runs to once a week and use lighter weights with more reps.