I Am Slow

When moving and doing certain things sometimes I can move that bit faster but it comes at a price my body aches and it triggers my back and put strain on my legs so I have to take it easier and not rush or do things fast my body can just not take it.in fairness I am over weight but saying that even years ago when normal still same had back and hip problems and things from age of 11 and was no wear near fat then so don't know if this normal or what.i was going physical therapy for a while doctor said can't do anymore and it's normal.