Cheetahs are smaller on average than humans and relatively slender. Your size is Medium.

You are proficient in athletics checks

Your base walking speed is 40 feet.

The average life expectancy of a cheetah is 34 years.

You speak cheetah and common.

One of your scores increases by 2, and another score increases by 1.

For every turn where you move your max speed, you increase your speed by 5 ft.  (Note that you have to move your max speed, if you walk on difficult terrain it is already cancelled).

As an action, you and all allies within 30 ft have their speed doubled until the end of your next turn. You can use this feature again after you finish a long rest (You use an action, but it is active on the turn you used and on the next one as well. So you benefit twice from the speed, while your companions once.)