Everybody

Everybody: (pronoun) every single body.

Everybody was able to choose his own bike.

If you don't like the generalized gender, try something like this:

We were all able to to choose our own bike.

How to Remember:

When you use "everybody," you are including yourself. Resist using "their." For example, incorrect usage would look like this: Everybody was able to choose their own bike. Since you are referring to yourself as well, you wouldn't use "their."

~Little Miss Grammar~