So i started lifting after a year or so again. Im trying to build a Home gym at the moment and combine some exercises they way i used to implement them at the gym. so i dont go for a rought start. I notice however that most of the times at the last set when i do the exercise i get a small electric shock at the muscle group.Not painfully but it really feels weird.Is this because i had to lift for a long time or is there any possibility i got a damaged nerved and need to check it up?