This could be me!

[rebbonk]

Arnie, a management executive, has on his doctor's orders, to take part in some form of sporting activity. Arnie decides to play tennis.

After a few weeks Moya, his secretary, asks him how he's doing.

'It's going very well, thanks,' Arnie answers. 'When I'm on the court and I see the ball speeding towards me, my brain immediately says: 'To the corner! Back hand! To the net! Smash! Go back!'

'Really? What happens then?' Moya enquires of Arnie, in some awe.

Spoiler:

'Then my body says, 'Who? Me? You must be kidding!'