i think i have pfs (runner's knee?)..my right knee has been botherin me since yesterday..it keeps craking everytime i bend it/stretch it..im thinking of goin to the gym today (coz i missed yesterday)..i was just wondering if it'll worsen it if i go today..(workout 4 today: abs/30 minutes on the bike)..

please advice...should i jus rest n ice it? or is biking ok