This depends entirely on your own capabilities. A short answer is that you should complete as many as you can with perfect form. When you break form (either due to lifting to heavy of a weight, or doing more reps than necessary) stop working the muscle as effectively and you increase your risk of injury.
in each workout you must increase either weight lifted or reps with previous weight or sets, if you want to keep growing...
It all depends on their height weight and natural strength but when starting it is usually best to go with light weight and high reps.
Usually u want to do the certain weight that is a challenge but not over board. It is better to do slower, controlled reps rather then incredibly dificult and uncontrolled.
It depends on your fitness level, but only a few reps are good for beginners.
You need to lift heavy weight to build muscle fast. This means you should be doing weight lifting sets in which you can only do around 6 reps per set.
It all depends, if you do your reps fast you will feel the pain faster, and if you do it slow and rest enough you will be able to do more reps, but what really is most important is your position (accuracy). you have to do it right, and not just rush it through.
To gain lean weight a person will want to eat more high calorie dense foods and eat every two to three hours. A few high calorie dense foods are peanut butter, lean red meat, bagels oats and dried fruit.
Failure is the point at which a muscle is no longer able to perform the work demanded. If a muscle is capable of lifting 100 lbs, 10 times, it is said to fail at that weight after 10 reps.
People do not stop growing by lifting weights. It was believed that weight lifting damaged the growth plates and stunted growth. It CAN happen, but only with very heavy weights, such as sets of 3-5 reps. They say no one should do HEAVY weights until they are 18, or fully grown.
I had heard that to become lean and not bulky to stay with smaller weights and up the reps, but my personal trainer told that was ridiculous. Truth of the matter is moving up to heavier weights isn't going to turn you into the terminator. Keep a journal when you're working out of the weight used, reps done, etc. Once you can do 15-20 reps without straining to get the last 5 or so, that's an indicator to get something heavier. And weight lifting is awesome for losing weight because building muscle burns calories well after the workout is over. Good luck! Have Fun
it depends on how heavy u are lifting and how often, i have been weight training since i was 10 years old, along with running and rugby. my muscles r alot mur developed than my friends and allot stronger. you must make sure that you are doing low weight but high reps. e.g start on a low weight that's right 4 u and lift 15-20 reps. and as you get older you can start getting higher weight lower reps like me. goodluck
You start off light don't over due it when I started I began with some nice reasonable weight and went for high reps to get the muscles used to the resistance as you advance you should keep increasing your weight once you feel more ease with your reps increase the weight. And take good supplements like protein powder and eat healthy all of this is key.