Although I am not a climber (my son is), I am serious about exercise at 54 years old! I run, bike, lift weights, and do some CrossFit type workouts daily. I took some of the Collagen for a month while my son was staying with us. It was when I stopped taking it that I noticed how much it it had helped. Soreness in my back and joints had increased, so I resumed taking it. Then we moved overseas, and I ran out again. (Same result). This was solid proof that the Collagen works! And, my orders arrive so quickly, even overseas! Thanks PhysiVantage!!!