I am new to working out so i really don't know much about anything. I started doing 5 day workout plan, and I was told that I have to rest muscles for at least 48 hours before targeting the same the muscle again so that's what I am doing alternating between different muscles. But the other day I was...

I am a skinny guy with an amazingly fast metabolism, no matter how much I eat just can't get any meat on bones. weight is proper for a guy age but I really want to increase the muscle volume of both arms and chest (because arms look like toothpicks and chest looks like a flat bench). I have being go...