I'm a 41 y/o white belt preparing to test in about three weeks. Last week, while practicing round kicks, I experienced a knee pop and an inward buckle on my pivot leg while kicking to a bag. I think I may have inadvertently bounced on the pivot/base leg thereby causing the extra stress. No severe pain, some minor swelling (which is mostly gone now) and instability. Have been using alternating ice/hot tub therapy and walking for exercise. My doc examined the knee (Lachman ACL test, McMurray Miniscus test, etc.), found no tears, and diagnosed a strain. Meanwhile, I'm getting through class, but without attempting kicks until the knee heals. Has anyone experienced this type of injury? Any advice on exercises to try? What was the recuperation time? Thank you!