i did this exercise together with a group of friends back in 2018. the pad was too high for someone of my weight at the time. permanent right knee injury after that. ever since then i cannot apply pressure on that leg, going up and down became a cautious endeavor.

all the doctors i consulted they all say only way for the gel between the knee to heal back is to loose weight and do exercises that doesnt apply pressure on the knees.

Go buy Joint Gout or Niao Suan Wan(Pil Urik Asid ) on Shopee.  Very good for reducing pain.