I am trying to simulate a person shoveling withing Solid Works to show the difference in muscle loading when using ergonomic shovels. I have created parts of the upper body, lower half, and bicep of the arm and struggling to mate them together (tried using hinge between bottom half and mid section, didn't work).

Any suggestions on how to accomplish this?

Attached the parts I am currently trying to use.

Thanks,

Shelbea