If someone walks/runs around a ground (or maybe anything like school.)
I walked one round. (Or should it be "lap"?) (Or: I've walked ten rounds)
I ran one round. (Or should it be "laps" instead of "rounds"?) (Or:I've run ten rounds; I ran ten rounds).
Like: "I've walked around this ground once." (I guess that this sounds really long and maybe it does not flow well)
Walk/Run ten rounds of this ground.
Take/Walk ten laps of this ground.
A teacher asks a kid to do this.