Resistance is the amount of contrary force against which your muscles must work in order to complete a movement. Most often, these are the weights being lifted or resistance bands being stretched.
No, boxing is not weight lifting
To be honest, I'm just starting out in weight lifting. But to me, power, as it relates to weight lifting, is the ability to consistently lift a given amount of weight.
Dumbbells provide fixed resistance. Fixed resistance provides a constant amount of resistance throughout the full range of motion (ROM) of a strength training exercise. This means that the amount of resistance/weight you are lifting does not change during the movement. For example, during a 10-pound curl, you are lifting 10 pounds throughout the motion. Fixed resistance helps to strengthen all the major muscle groups in the body.
breath out when lifting and breath in while you lower the weight
These terms are used in weight lifting. They are different techniques of lifting the weights.
By lifting, your body is doing resistance training which makes the muscle working on stronger.
Weight-lifting is also known as "pumping iron".
This depends on the person and the kind of weight lifting you do. The short answer however is that lifting weights should help you to lose fat and gain muscle. If you are lifting heavily in order to gain muscle mass, you will gain weight. However, if you are lifting to get lean muscle, it should help to lose weight.
There are information about weight lifting in books, magazines, and websites. Exercises and machines or weights to do weight lifting can be found at many stores. Before beginning any weight lifting be sure to talk to your doctor.
It's hard to explain, so I'll put it this way. Assuming you know what a Bench Press is, when you push up there is positive resistance. Say the bar ways 45 lbs and you have 55 lbs of weight plates then there is 100 lbs of positive resistance. When you let the bar down after you have pushed it up there is 100 lbs of negative resistance, because it is coming towards you, you are not working to push it up but rather to take it down.
effort, resistance
Yes you're ready for lifting at the age of 16.