Go Heavy or Go Home
No, I wont really send you home.
Actually lifting lighter weights for a higher number of reps (working the endurance of the existing muscle) has its benefits too! I incorporate a little bit of endurance training. I just prefer to focus on heavy lifting more often, and have for years, because I like those benefits even more. WHAT DO YOU PREFER?
What constitutes HEAVY is all relative to your own personal strength and opinion. I just moved up to 25lb bicep curls and can’t finish a set of 8 yet.
So to me at this point in time, that’s heavy