Equipment for GoFor20
Essential Equipment is used regularly during the workouts, but substitutions can easily be made. For example, a sand filled milk jug could be used instead of dumbbells. Whatever you have to replicate the exercise is perfectly fine.
In almost all situations using a piece of equipment is appropriate. My suggestion is to perform the exercises using equipment before spending any more money. If you are ready to add to your arsenal of weapons, think through your purchase to ensure you are getting the right piece for you.