What is the Leg Shaker?

You say the "leg shaker" is better than bike riding for good leg exercising.

But, when I ask you what the leg shaker is or where to get it, you won't tell me? I guess I haven't evolved enough for mind reading.

One last time, what is the leg shaker you said is better than bike riding? Who makes them and where sold? I did not find on google. Need the exact name of it.

Thanks MH.

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