Just give it everything you've got and bowl as fast as possible.
I throw as hard as I can when I think I have to throw as hard as I can.
I only know one speed.
The sky's the limit as fast as I can ever run.
I would love to bowl 160 km/h. Any fast bowler would love to do that. But for me that is almost impossible.
I don't recall ever desiring to go as fast as possible.
I have two speeds, nothing and full pelt.
I like to go full speed all the time.