I am a 17 year old guy. I play football (Offensive Line). My dad’s side of the family has a history of Arthritis. My grandma can barely walk, and my dad is in his upper 40’s and he is already struggling to walk at night. My knees hurt really bad after I exercise, and when i wake up (or after resting) i can crack my knees (you will hear a pop). Also when I make a fist (both hands) my joints will pop. Any help would be greatly appreciated!!!!!