How to increase bowling speed as fast bowler in cricket

To bowl faster, you need to have 

1. Good fitness
2. Good run - up
3. Good practice

 
1. Fitness 

• Strengthen your shoulders and thighs.
• Concentrate on your core(abs and lower back).
• Run a lot. Do more sprints. Increase your endurance because fast bowling is not easy.
• Fitness also includes maintaining a healthy diet. Eat a lot of protein to build strength.

2. Run-up 
 
Your run up is the most important part of your bowling. For a fast bowler, it's usually long. You should have a smooth run up. 

To improve your run up, you could work it out during your fitness session. Mark your run up. And start doing sprints up to that length. You could even do your bowling action here without the ball. 

3. Good practice 

You need to practice a lot. Being only fast and not maintaining line and length will not do you any good. 
Your speed will come eventually if you're practicing right. 
  During practicing sessions, first 2-3 balls, just warm up and after that, start using your shoulders while bowling. Give it all you got. And don't forget about where you wanna pitch the ball. That's important too. 


Don't forget to stretch before and after your session. Fast bowlers are prone to injuries. 

All the best.