That's actually some solid advice. The best about it, you can do all this at home without the need of a gym subscription. Also since you're using weights or your body, you don't isolate your muscles but also work out the surrounding muscles for stability. This vastly reduces risk of damaging your joints and reduces risk of a body unbalance.

Personally I'd add crunches and my favorite, the Superman, to strengthen back and abs. Sometimes I add dumbbells on the side and lift them half way of a jumping jack for the deltoids. Also imple shrugs works as well.