I workout in Houston where the weather can be unpredictable. Most times, it's pool time that gets the short end of the stick. Be it a thunderstorm or just some kid that dropped a deuce! For me, it happens when a group workout becomes a individual workout due to low turnout. I like to be able to participate in order to elevate the performance of my athletes.
The goal is to have a back-up plan. Many of us have a traveling locker room in our trunks, make sure to have a spare swimsuit and sneakers in case your workout plans change.