Okay, if you follow these instructions, you should gain weight.
First of all - don't push too hard. This is most important at your age. If you push too hard (and I'm going to suggest weight training below) - you might damage your joints, and while this will surely heal as you grow (I've seen it happen in a growing person), it will effectively stop any training program you might have until you're much older. So be careful.
The second point is - eat. Your body is growing so it needs a great deal of 'building material' shall we say. If you add exercises to this, you need even more building material, i.e. food. Exercise rips and stresses the muscle fibres, then this needs to be repaired by the body. If you don't want to be affected height-wise, you MUST take in enough nourishment both for your growing body and for the exercise you're doing.
Okay, down to business:
1) Eat six meals a day. They don't have to be heavy meals, but they have to be high on protien, low on fat, and medium on carbs. Go for lean meat and potatoes as a base. Dividing your intake into six equal meals allows your body to absorb much more from the food than it normally would.
2) Sleep well. This is VERY important - the body builds and repairs tissue in sleep. You NEED your sleep if you're training hard for bulk.
3) Drink plenty of water - water is one of your body's building materials! Remember, a good percentage of your body is water. So, to build muscle, you not only need surplus protein, you need water too.
4) Exercise different muscles on different days. For example, if you exercise your arms and upper body on one day, then exercise your legs on another. This way, the muscles get more time for repair and 'building' - if you exercise the same muscles every day, they will never get the time to build, and you just won't put on much mass no matter what you do (remember, the body works slowly - think of the way a cut heals).
5) The MOST important point of all. Exercise with weights. If you can afford to, buy a blank dumbell and add as much weight to it as you feel comfortable with.
These are the weight exercises that build most bulk:
a) Bench Press (can be done with a dumbell with you laying at the side of a bed or a sofa, with the hand doing the exercise over the side) - I'm assuming here that you don't have the cash for a bench, barbell, etc. so I'm suggesting things that can be done cheap.
b) Shoulder press
c) Squats (knee bends) with weight in your hands.
These are the best exercises for building bulk - they'll build bulk muscle in your chest, in your arms, in your legs and lower back and abs. After you've built sufficient bulk muscle you can 'fine tune' your body with other weight exercises, but the exercises above are a quick way to bulk up.
You can use a brick or stone (that you can grip) if you can't afford a blank dumbell and some weights, but I'd say go for the dumbell and weights if you can - that way you know EXACTLY what weight you're doing and exactly how much you're increasing by when you increase. Buy a used one if you can, they aren't too expensive.
A hint - if you can do less than ten repetitions with a weight, it's probably too heavy for you - if you can do more than ten repetitions, it's too light. Somewhere around ten is optimal.
If you'd like I could post more clear instructions on exactly how to do each of the exercises above. I train people in the martial arts and physical fitness, so feel free to ask about anything.
I hope this was of some help. Good luck.
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