You're right... sadly, my social life consists of taking my kids to their activities.
My son started gymnastics on his 4th birthday (he turned 11 in January) and he loves it. Good thing, as he spends 12 hours a week at the gym. My daughter is also in gymnastics, but in an advanced recreational program called gymnaestrada, which combines gymnastics and dance routines. They mostly do performances rather than competitions. She trains 4 hours a week.