R Kannan writes:

So they work by closing the circuit then? What is the purpose of the the
circuit pattern underneath the button?

Is it possible to get replacement buttons to get these to work?

First just try cleaning the underside of the rubber buttons and the
circuit board pattern. All they do is connect to two interleaved patterns
together.

There are all sorts of ways of restoring these. Some work better than
others. But for 3 or 4 buttons on an exercise bike, replacing them with
pushbutton switches may be most straightforward.

--- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
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