Pull Ups are a good alternative for building upper body strength and can be a good equivalent from using everyday gym equipment such as dumbbells, barbells and resistance machines. Why else should I do Pull Ups?
It's good for you – Pull ups is a compound movement which requires more muscles to perform the exercise thus burning more calories in the process.
Do it anywhere – all you need is yourself and a bar! Very easy exercise to set up plus it can be done at home!
For a full demonstration ask a fitness instructor - It will give you a much deserved challenge!