Well, depends on the age. My daughter, now 14, tried different things since she was 3.
Dancing: For few terms - she liked it, but she liked other things more, so we dropped it.
Basketball: For one term - same as dancing
Gymnastics: 2 years (I think) - liked it, but then the timing didn't fit anymore or something like that
Swimming: Many years, since she was a baby - got to boring for her then
Icehockey: For 3 years - loved it for 2 years, then switched teams and hated the new team and trainers (bullying etc), so stopped
Taekwondo: Since age 11 - currently wants to stop, but I push her to continue
Choir: Since age 11 - loves it
Violin: Since age 6 - loves it
Percussions: The last 2 years - loved it, especially the steel drums; she has to stop, because she doesn't have so much time anymore (she was homeschooled the last 3 years, so had a lot of time for activities. Now she's back at school)