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