Can I exercise the days BEFORE FUE procedure?

Hello, I am undergoing a 1,600 graft FUE procedure six days from today. The pre-op instructions advise me to avoid exercise the entire week prior to the procedure. Why should I avoid exercise BEFORE the procedure? I understand that AFTER the procedure, the grafts are delicate and that exercise can increase scalp pressure and pop out the grafts. However, why should I avoid exercise in the days BEFORE the procedure? Thanks!