Abishek emailed in a question:
"I am a 17 old leg spinner. I am 160cm tall and underweight. I have never tried doing any fitness exercises. Can you recommend some to start?"
You could do what the 17 year old lads do in my gym, and walk in, head straight for the bench press and try and lift too much weight without warming up.
But I wouldn't recommend it. You will get injured. And you look silly getting stuck under a bar.
Fact is, there are a load of different and safe ways to exercise.