Strength training is the use of resistance to muscular contraction to build the strength, anaerobic endurance, and size of skeletal muscles. There are many different methods of strength training, the most common being the use of gravity or elastic/hydraulic forces… Full Answer
Yes, I've tried and continue to do strength training for my overall fitness. It's very important to do both cardio and strength training. Strength exercise build more lean muscle mass which boosts your metabolism.
Assuming that you are eating properly and using a good strength training program, strength training will increase your muscle mass. Just look at champion bodybuilders, especially champion natural bodybuilders: they all became more muscular by doing strength training.