Out of those ethnic groups is a group called the Maasai. What is a former "past time" of the Maasai?

A) dancing

B) hunting lions

A) dancing

Explanation:

First, since the question asks for a "part time", we have to remind ourselves that for most indigenous people (of any tribe, anywhere), hunting isn't a "past time", it's a necessity. If they don't hunt, they don't eat. And they respect the animals too much to just do it for fun.

In the case of the Maasai, they do kill lions now and then, but it's a rite of passage, not a regular source of food and certainly not a "past time".

So, that leaves only "dancing" as possible answer.

And they do dance a lot, it's true, for most and any reason at all.