One thing that you commonly see among young players is the collapsing of the front leg. With this, the energy that is created through run up, gather, bound and landing is basically transferred or absorbed by the collapsed leg.
What you ideally would like to do is transfer this energy through to your upper body propelling it towards target (the stumps). In order to do this you need to create a braking force. Think about when you are riding your bicycle and suddenly lock the front brakes. If you have enough speed you will end up over the handle bars and the same basic principle applies to when your lock that front leg when bowling. It creates the brake to force the energy to be transferred to your upper body and propels it towards target.
This is a simplistic view of why you want to strive to lock that front leg but there are number of factors that impact that. Find out what these are by subscribing to our Members Area.
This opens in June 2019 so if you subscribe before the you will get a special introductory price of $50.00 for the year.