It sounds simple but just start writing. Anything. I write a diary almost every day and, yes, it's full of dreary stuff about what I've cooked for dinner (actually I enjoy cooking) and whether it's been raining when I wanted to peg the washing out. But it's words on a page and it can massage those stiff writing muscles. Also I recently had a go at writing a three-sentence story. It's amazing how this triggers your imagination and offers more to play with. Here's one:

To her surprise, she found a motorbike in a layby, unattended, the key still in the ignition. She looked left and right, and then hopped on, revved the engine and rode off laughing over the hill and down dale, her hair flying, until she came upon a police road block. After two hours in the cell she was no longer laughing but rehearsing different versions of her apology to the burly policeman for stealing a his bike.

And another:

It was evening and Sarah was typing on her laptop. Outside a strange, white cat miaowed plaintively and it was as much as Sarah could do to keep her mind on her task. Finally, she gave in and went out into the dark to give her unusual visitor some cuddles, but on arrival she found a tuft of white fur, a red collar and no sign of any cat.

This one ended up as an unfinished twitter story. Perhaps that's another good way of getting inspiration: writing in short chunks which twitter makes you do. You don't have to do it on twitter of course. Just do it at home on your laptop or in a notebook. Or even dictate it on your phone.

Photo from Wix