prop name / picture "dictionary" would be useful for beginners. I'm used to calling a 65 cm ball a "big ball", not sure what prop name it corresponds to in this web site. Similar for "squishy ball (~20 cm), "foam block" (~10 cm x 20 cm x 30 cm)

Curt ~ Thank you for your feedback. We are working on updating our beginner center, so this information is very helpful. The "big ball" you mention would be equivalent to the "fitness ball," the "squishy ball" would be an "overball," and the "foam block" would be a "yoga block." I hope this helps!

I agree with Curt Hern - though I've been receiving pilates lessons in real life for a couple of years now, I'm new to PilatesAnytime and would especially appreciate some help in differentiating the different kinds of balls!

I'm looking for the translation for the acronym "GRF." I heard it several times in a recent video I viewed about, "The 100." I apologize for not being more specific with which video. Let me know if I need to go back to my list of viewed videos in order to be more specific. GRF sounded like a term that is used often. I'm a first grade teacher and there are so many acronyms in the educational field, they usually stand for something obvious, but for some reason, I'm not figuring it out, yet! LOL! Thank you!

Lisa I believe GRF stands for ground reaction force. I first heard of the acronym in work that was associated with Judith Astons work.