In hs, I was about 5'10.5 and a disgusting 135 lbs. Now, I am 6' and 175lbs.
You've got nothing to worry about as far as physique goes. That's definitely within the range of "athletic," rather than "skinny," if you're solid, with a good weight distribution. Good job, mahon.
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Theories on how to bulk up have evolved considerably as of late, in a way that's good news for those of us who don't have a lot of
time on our hands.
I've recently read about in several sources that the key to gaining weight and breaking plateaus is to mix up your workouts, use
very heavy weight (1 to 2 reps) at some point in the workout, preferably just after warming up a bit. Get to the point and don't do too many sets, so you can get some food in you to rebuild ASAP. About 45 minutes max for workout length, preferably less. And allow yourself to recover
completely before working out again. Preferably take a
week between working the same muscle group. And don't do a lot of cardio.
Some supplements, such as creatine, glutamine, glucosamine sulfate, a good iron-free muti, essential fatty acids, and antioxidants -- especially vitamin C -- help, too.
Do all this stuff and you won't have to worry about the eating. You'll be as hungry as a hog. Just eat a good balance of protein, carbs, and good fat. I do recommend
naturally-raised, i.e., organic meats, if you can afford them, because the lack all those female hormones factory-farmed animals are loaded-up with to make 'em soft, tender, and chubby.
The main point is to subject your muscles to as much resistance as they can handle without injury, and that muscles are built during the
recovery period. Makes a lot of sense.
I've been at a plateau that was solid as granite, took a break, and have started back using this regimen. Early results are very promising: I lifted 2 days ago, upper body only, and have gained about 3 lbs since then.