Beyond a full workout, you can save a sub-workout block — like a warm-up you reuse everywhere — as a template.
Build the block, remove everything except it, rename it, then click Save as template, exactly like saving a full workout.

Then reuse it anytime: open the Workout templates source in the workout editor and drag your block into any workout.

That's a big time-saver — the more you use Gymkee, the more it compounds.