<human>: Objective: how do you do jumping jacks?

Which of the following solutions is more sound in terms of naive physics reasoning?

OPTIONS:
- stand up straight. jump separating your arms and legs at the same time. then jump back to your straight position. repeat for however many number of jumping jacks.
- jump up in the air.
<bot>: stand up straight. jump separating your arms and legs at the same time. then jump back to your straight position. repeat for however many number of jumping jacks.