For a solo workout:
- membership card
- water bottle
- sports-specific gear, such as yoga mat, swim goggles, or weight-lifting gloves
- work-out clothes and shoes
- flip-flops for the shower
- towels, if not provided at gym
- toiletries
- clean underwear
- plastic bags for wet clothes/swimsuits
- padlock for locker
- MP3 player
- change for vending machines
When the whole family goes to the gym:
All of the above for each person who's exercising, plus:
- diaper bag for babies/toddlers staying in gym's child care center
- socks for kids playing in indoor play areas
- swim diapers, if little ones will be in the pool
- towels from home, if ones at the gym are too small and thin to keep kids warm
- pajamas, if it's an evening workout; don't bother putting street clothes back on!
