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CardioVascular Endurance
Undecided,
It's not your age, it's your state of physical development. If you're still growing rather than broadening out, light weights and high reps will improve your strength without placing too much stress on your joints. If you've pretty much had your growth spurts and are broadening out, you should be fine to do heavier weights for bulk and strength.
I did weights from the age of 15 whilst I was playing rugby, using light weights as I was still small(!), not a hell of a lot of improvement...I only started on heavy weights at 19, when I finally had my growth spurt and started being able to build up a little bit.
If you're unsure, stick to light weights, and lots of bodyweight exercises.
It's not your age, it's your state of physical development. If you're still growing rather than broadening out, light weights and high reps will improve your strength without placing too much stress on your joints. If you've pretty much had your growth spurts and are broadening out, you should be fine to do heavier weights for bulk and strength.
I did weights from the age of 15 whilst I was playing rugby, using light weights as I was still small(!), not a hell of a lot of improvement...I only started on heavy weights at 19, when I finally had my growth spurt and started being able to build up a little bit.
If you're unsure, stick to light weights, and lots of bodyweight exercises.
Like druadan said, if you've stopped growing, you can use heavier weights with low reps. This will make your muscles grow and improve strength..however, endurance is more important if you're going in the forces, so until after your training finishes and you are with your regiment, I'd stick with high reps.
"Some day a real rain will come and wash all the scum off the streets..."