Using manual reels and heavy brushes doesn’t do any damage short term many times years ago you’d go home with no problems and not just through age this can affect you at any time,gradually you start getting injuries and trust me it’s manual reeling heavy poles and brushes that contribute a lot to it.
I would say to any Newbies get a head start on all the other people that don’t listen buy this this and this and give yourself a chance of having an easier working day,big investment big rewards 💪💪💪💪