Fat experiences

Stretching and strengthening exercises that target the muscles that support your knees may help ease pain.

Some useful GIF images showing you how to stretch here: www.healthline.com/health/exercises-for-knee-pain

I'm not a fat person, but I know that others have found water-related exercise (e.g., swimming and aerobics) to be an excellent way to strengthen one's body.

[quote]AnxiousFeedee:
Anybody else have problems w/ their knees while going up stairs[\quote]

You might have osteo-arthritis (e.g. loss of cartiledge). Were you a runner? Supplements with MSM/Glucosamine might help.