建議讀下‘磚家’意見...

https://www.quora.com/Does-climbing-up-or-down-stairs-have-any-adverse-effect-on-your-knees 尤其是：Noel Gill "If you never had knee problems, then it's absolutely fine. Climbing the stairs gives your legs a great exercise. However, I wouldn't advice you to climb 15 floors every now and then." 似乎是針對你的情況專門解答的。