How to exclude idle time from pace?

I do a lot of interval training during pool swims (eg 10 x 100yds on 1:20 and then a break before the next set when coach gives direction). I’d like my watch to track my pace while I’m actively swimming minus the idle time between sets, which shows the pace as much slower. I’ve heard that Garmin watches can be set to not count idle time. Can the Apple Watch be set to exclude idle time from pace? Thanks.