The context of the following conversation is Lee wanted to do a swimming work out so he threw a toy in the deep end of the pool and wanted to see how fast he could get it.:
Lee says I'm exhausted after spending the afternoon in the pool..
The friend responds How many laps did you swim?.
Lee responds I didn't swim laps, but I did throw a pool toy into the deep end and timed myself to see how quickly I could grab it..
The friend responds That sounds like it would be very tiring..
Lee responds Yeah, by the time I got out of the pool I felt like I'd run a marathon..
The friend responds At least you got some good exercise in..