Your diet and the muscle repairing itself after the workout. It will only repair and grow stronger if you eat well, include quality protein, and allow plenty of time in between workouts for rest and recover. This is why you should not weight train every day.
both are good for muscle building.
Exercise at times can definitely make you gain weight especially if your workouts are mainly muscle building instead of cardio. Muscle weighs more than fat so sometimes gaining weigh isn't such a bad thing, especially if its muscle. In the long run gaining a few pounds of muscle is very beneficial towards you because the stronger your muscles are the faster and easier it will be to burn calories.
no steroids give you the abillity to train longer and harder
They discovered how to make and use concrete for their building structures.
Luckily, it can. When it repairs it can get even stronger. This is the concept of working out, tearing muscle, and building it back up to make it even stronger.
to make you build muscle without you hurting yourself. you will build muscle faster with it but it also keeps you safer. dont ask me how it just does.
a muscle pimple
they make you play better in sports. and they can make you faster!
Building muscle increases resting metabolism ( although not as much as people think) ,increases muscle size which is what increases tone ( that and losing fat that surrounds the muscle) , makes a muscle contract faster which increases speed and power in sports , helps with balance and helps prevent injury among other things
steriods
LA Muscle, a UK-based company, makes muscle building and weight loss supplements. They do not have a muscle on their Facebook page at this time. However, since they do work in muscle building, they may occasionally use a muscle in their advertising.
Muscle building improves your posture, body functions, circulation, metabolism and your skeletal structure.