how do i assemble manikin with my cycle so that the two model turns into one model

I think some expect too much from their CAD design software. The primary function of the CAD software we engineers purchase and use is engineering design. The primary function of this software is engineering not artistic animations. Complex animation as in a movie type application is a different field, and the software used is not our engineering based products. The animation tools are limited as animation is not a primary engineering function.

I had the same situation a few years back. I documented my results to share with others. Attached are two documents which should help you with this challenge. the 1st is a simple solution only showing the manikin feet moving with pedals (no ankle flex). The optimized solution shows a more realistic foot movement that includes ankle flex. Have a look at the documentation and please feel free to contact me with any questions.