I would love to have a toggle on GC to exclude the warm-ups and cool downs (which planned in GC web or mobile). Today the warm ups and cool downs works only as a direction for the watch and add a splits. But this parts of a workout should be labelled somehow and web-interface (and mobile app too) should have a toggle or an option to exclude this non-productive parts from calculation avg pace, running dynamics, HR, etc. For today the only alternative to achieve such experience is to create separate workouts for each part, which (1) inconvenient to create and (2) more inconvenient to apply on the watch when running.
Please consider to add such useful feature to GC!