This is my first day here but everywhere I look I see people saying exercise is only a fraction of good health and that you also need to switch up your diet. I am 5'10 and weigh 130 lbs. and even though this is the first time in my life starting to exercise I have a fast metabolism and am in pretty good shape. So if I'm not trying to lose weight and just want to get more muscle definition and strength, do I really need to change the way I eat?(as far as I'm concerned I have a healthy diet already, excluding the occasional pack of twizzlers and whatnot)
If you're trying to build muscle and strength you need to change your diet up. Body requires more fuel to build muscle. Higher protein complex carbs etc. Not sure what your diet is now of course but if you are eating enough and often enough along w/heavy weights you will build muscle. :)
take a supplement with good diet to build a muscle.