I have worn them for a year or so on flat ground with no problems.

He is expected to throw again on flat ground today.

In the middle of the flat ground stood two great stones.

"But we would have spent more time covering flat ground," she said.

He is throwing off flat ground every other day for 8 to 10 minutes.

He wondered why they did not move out into the open and walk on the flat ground.

All that morning he had seen nothing but flat ground.

We learned too late that one should park on flat ground.

Then, on a stretch of flat ground, he began to run.

Maybe a little more, depending on where the next flat ground is.