Jump, Jumps Or Jumping

Hello everyone,

Is either "jump", "jumps" or "jumping" okay in the following sentences?

1. When will you be doing your jump?

2. When will you be doing your jumps?

3. When will you be doing yout jumping?

Answer: We will be doing it at this tomorrow.

PS. I got the first sentence "When will you be doing your jump?" from an activity book and it has been answered as shown above. I'm so confused because it talks about a group of people who want to jump out of a plane, but "jump" has still been used not "jumps". I'm going to upload the photo of that page. Could you please tell me if it has been written correctly?

WRITE DESCRIPTION HERE

WRITE DESCRIPTION HERE

Regards,

JA