Posting 3rd time here since likes of
@IMMY69 is having sleepless nights that Bumrah has surpassed actual Immy as a bowler
Summarizing what Pont said:
'You can see his arm straight from the wrist to elbow. The rule is when it is above the vertical that the elbow must not bend past 15 degrees,' Pont said.
'You can clearly see the forward flexion in his arm, which is a hyperextension. This is allowed (a forward bend) for people with hyper-mobile joints.
'A hyperextension is a movement in a similar direction to the direction of movement - not downward or to the side. This is why Bumrah's action is classified as legal since it is within the guidelines of hypermobility.'
Nottingham Trent University senior lecturer in biomechanics Paul Felton has worked with numerous cricket coaches and further explained how the hypermobility is an advantage for Bumrah, but a legal one.
'His hypermobility also provides further advantages (in) that he is able to maintain alignment throughout his bowling action which reduces variability in his control of line and length,' he said.
'So, his hypermobility makes him unique. That he's able to maximise speed by accessing more optimal movement patterns which increases control and provide lower injury risk.'