ride a bike
I can ride a bike./ I can't ride a bike.
rollerblade
I can rollerblade./ I can't rollerblade.
play football
I can play football./ I can't play football.
play tennis
I can play tennis./ I can't play tennis.
ride a horse
I can ride a horse./ I can't ride a horse.
run
I can run./ I can't run.