Is there a gym near Science World?

Yes. Several gyms sit within a ten-minute walk of Science World, clustered along East 1st and East 2nd Avenue in Olympic Village and up toward Main Street. The Main Street-Science World SkyTrain station makes the area reachable from most of the city in under twenty minutes.

This is a direct answer from the CrossFit BC coaching team. Short version first, then the detail and the local context for training in Vancouver. If you want the same answer applied to your own situation, a coach will walk through it with you in person.