Fat fu  ff8  cks always have an excuse for being fat.   Yeah I have heard the 'my knees' excuses so many times I don't even react anymore.  I have been running every day for years, the latest streak is 6 years, before that bikes and before that running.  Biking is much worse on the legs BTW.   This is my 34th year of regular daily exercise and much of it has been running.     Now if you ask me to carry a 50 pounds extra load I would guess my knees would be wrecked.  Fat fuks always have an excuse for being fat.