Simplify the following text for a Grade 12 native English-speaking person.
Original: Doctors and arm wrestlers recommend doing rehabilitation training or therapy , exercising with light weights and many repetitions for 30 - 45 minutes non-stop to pump the blood into arms .
Simplified: Doctors and arm wrestlers recommend doing rehab ( training\/therapy , exercising with light weights and many repetitions for 30 â `` 45 minutes non-stop to pump the blood into arms ) .