When you are at an athletics match or watching a race, it is often nice to sit in the sun to watch. Having a light foldaway chair is great as you don't need to worry about sitting the stand (if you are at a track) or on a park bench etc.

Also when you are training (as a track runner) if you have long intervals, why not sit down between reps. You'll often see more "senior" athletes bring chairs to the track for between reps - so why not all runners. We can learn from our elders, they have many years of experience and may just know a thing or two!

Many of the camping type foldaway chairs now are very light and portable (and many even have a drinks holder). They can also be a useful place to hang your kit if the floor is damp.