Cycling
"Ride as much or as little, as long or as short as you feel. But ride." - Eddy Merckx
Running
“Run when you can, walk if you have to, crawl if you must; just never give up.” — Dean Karnazes
Swimming
“The pool is where excuses go to drown.” - Anon
Other Sports
“Perfect technique beats raw effort every time.” - Anon