Ishant has everything a fast bowler needs. If he concentrates on the two most important things, he should serve India like Zaheer Khan for the next 10 years or so.
1 — His fitness and injuries. Know your body and listen to it, keeps things simple)
2 — Be consistent, play to your strengths and focus on mastering them.
The following is a technique used by a one-time fast bowling hopeful, who was victim of family pressure to concentrate on academics, and also to a larger extent, of a prejudiced cricketing system where regionalism, money, politics and nepotism play big roles.
This technique is recommended by my coach and colleagues (including pace guru TA Sekhar) and even legends like Curtly Ambrose and Wasim Akram: