It won't do you any good to succeed at that if, in the process, you injure yourself.
Warm-Up
Warm-up is important.
Warm-up is light, easy, repetitive exercise for long enough to get your blood flowing a little bit. Five minutes is usually enough.
Stretching
Warm-up is not stretching. Don't stretch cold muscles. You could injure them, and stretching before exercise provides no benefit in injury-prevention or in performance.
Stretching after exercise or in a stretching session separate from exercise will make your muscles more flexible and supple. In the long run, that will prevent injury.
Stretching is a good thing. If you watch TV or movies, that's an excellent time to stretch ... unless you're actually in the theater.
Smart Safety
I mentioned that day before yesterday I found some exercises from a Starbucks wi-fi ad.
One of them was not very exciting, but it was a pretty good exercise. It was just a jumping jack with a squat thrown in while your legs are out and your arms are up.
I wondered how that would work on a person's knees, and I found out on mine by the 2nd or 3rd jump. I started feeling a pain on the inside of my knee. I tried a couple more jumps and squats, and the pain was still there.
When I was younger, and stupid, I might well have made the effort to do the exercise differently or work through it. The pain wasn't great.
This time, I simply dropped the exercise and found a different one.
I recommend you do the same. Leave the exercising through pain to professional athletes with well-trained coaches who know what's safe. (I'd never trust the average high school coach to know what's safe.)