| Re: weight lifting and neck exercising
3 pound weights are not really going to give you any real benefits, even at 16 and if you were really skinny. If you can do 250 reps without a break, they just aren't heavy enough.
What you need are big enough weights that you can only do 10 - 12 reps at a time, before having a short rest and doing another 10 - 12. (These are called 'sets', and usually you do 3 - 5 sets per exercise with between 60 - 120 seconds rest).
Until you get the bigger weights, I would try and do some bodyweight exercises, such as dips, press-ups, sit-ups, chin-ups etc. Again you want to stick with the reps/sets outlined above. If they're too easy doing 12 reps, do them slower - e.g. dips, take about 3 seconds to lower your body, hold for 2 seconds, then up for 3 again. The faster you do an exercise, the less benefit you'll get. (Though don't do them tooo slow either!)
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