Aneurysmal bone cyst. Rest completely?

Receny mri of my knee shown a aneurysmal bone cyst, Will that go away on its own. I was given gemcal tablet, carnitine mecobalamin folic acid tablet, sodium hyaluronate tablet.I was advised to reduce activities like avoid staircase,long standing and not to put starin on my knee. Upon doing so will the cyst grow ? I don't play sports all I do is walking I walk on average 5kms in a day and use stair case four times My parents are saying this came all beacuse of my daily activities walking a way too much I want to start exercise but because of this cyst I'm worried that I should not do anything that puts stress and I'm going on with activities daily is this okay or do I need to take rest completely? I m working professional