But you have to do something in those 15 mins, it shouldn't be so people can leave their devices afk and it gets minutes.
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I imagine it would be like the old PC treadmills, where you walked on a belt that changed your x-axis, moving you back. It forced you to keep moving, or else you would fall off. It also prevented you from moving too far forward. You had to stay within the parameters.
Similar too was the weight bench. You had to lift when it told you to lift, and drop when it prompted you to drop.