I had an idea based on seeing something about 'parkour' or 'free-running' and a story about boys who ran through gardens, leaping over people's fences. So the sport that came to mind was not free-running but hurdling:
The hurdler hurtles down the track
His friends and foes are far behind
Rows of hurdles lie before him
Like garden fences in a line
is starting point. Is 'hurdler hurtles' too obvious? 'Friends and foes'? But how else to describe them. 'Competitors' is far too clumsy. Repeat 'hurdle' in line three or not? It's only line 4 I'm remotely happy with so far. And how will it continue?
Not known for my sporting prowess (is that a female prow?) or knowledge (when asked my favourite football team I always reply Hamilton Academicals - such a good name) I was perplexed to be asked to contribute to an anthology of poems about sport - to coincide with the Olympics. That gives you some idea of how long a book takes to get into print.
Nothing daunted, I am working on several.
A few years ago i was asked to contribute a short story to Gary Lineker's Book of Football Stories and did so, discovering that there were many ways to tell a football story from the viewpoint of the less successful participant. And a number of footie poems followed for various Macmillan anthologies.