Enable "delete" and "enter" within the platform and workout builder, so you can remove items with the keyboard.
On the calendar, you can use the "delete" button, but need to use the mouse to confirm. It would be great to use "delete" and "enter" to confirm that you want to delete an item from the calendar. Toggling between the mouse and keyboard is slow. Using the mouse to do 2 or 3 clicks is slower than the keyboard. It adds up a lot over time.
In order to delete a strength training workout exercise or superset, you need to do 3 mouse clicks... It would be so much better to click the item, then "delete" and "enter" to remove it. When making and editing a lot of workouts, if you can save a few seconds hundreds of times it really adds up and makes the UI much more enjoyable/less-painful to use.