All of the above is true and good advice. I recently tore my rotator cuff had recently had surgery to correct the problem (injury was from playing basketball). I started out as an apprentice in July of 1960. I recently celebrated my 47th wedding anniversay.
I was fortunate when I started, we didn't have to carry that pipe up a ladder. We climbed the ladder dropped a rope down, dragged a pic up and set it between the trusses, dropped the rope back down and had floor person (journeyman) tie rope on RMC and hauled it up hand over hand by the rope. Hot, dirty, and hard work. Much easier now; with JLGs and lifts.
Bottom line, if hard work bothers you find something else. IMO there is no better job anywhere, anyplace than being an electrician. Never ever trust anyone in terms of your own safety; you are responsible for your safety. I have made many friends over the years. Some from the electrical trade, some from other trades, some from engineers, some from inspectors.
Don't tell the engineers or inspectors I said that though, they'll get a bigger head.