Brass and bronze, an alloy made from copper and tin, have been made for thousands of years, although brass was often made by accident. Early intentional brass was actually made with calamine, a mineral which contains zinc.
As I mentioned, you should strive to lift weights 3 times a week, but if you can only make it twice, you will still get most of the benefits. 4 1. Full-Body Workouts
A National Academy of Sports Medicine answered. Studies show you should perform 2-3 sessions of weight training a week with 24-48 hours in between sessions that work the same muscles. For example if you do an upper body workout on Monday do not perform another upper body workout again until at least Wednesday.