What's he going to do?
He's going to play baseball.
What's she going to do?
She's going to go cycling.
What's she going to do?
She's going to go swimming.
What are they going to do?
They're going to dance/do ballet.
What are they going to do?
They're going to go ice skating.
What are they going to do?
They're going to go skiing.
What's he going to do?
He's going to go mountain biking.
What's she going to do?
She's going to do kung fu.
What's he going to do?
He's going to go rock climbing/climb the mountain.
What are they going to do?
They're going to play beach volleyball.
What's he going to do?
He's going to play basketball.
What's he going to do?
He's going (to go) skateboarding.
What's he going to do?
He's going to go surfing.
What's she going to do?
She's going to play tennis.
What's she going to do?
She's going to go rollerblading.
What's he going to do?
He's going to go sailing.
What's she going to do?
She's going to do yoga.
What are they going to do?
They're going to play football.