Stand in a circle. The first person (A) starts miming an activity, such as eating an apple. The person to their left (B) says “What are you doing?”. A keeps miming and at the same time says the name of a different activity. For example, if A was miming eating an apple, they could say “playing the piano”. B then starts playing a piano. A stops their mime. Now the third person (C) asks B , “What are you doing?”. B keeps playing the piano and names a different activity, which C must mime. And so it goes on.
There should be no repetition and no similar activities. For example if you are miming climbing a ladder you cannot say, “climbing the stairs”. Equally you should not name an activity that looks like the one you are actually doing. For example, if you are cleaning a window you cannot say “waving good-bye” – because it looks very similar!