Therefore, the most plausible explanation is that this refers to:
The "Nastia Muntean" variation likely seeks to balance three distinct physiological goals in a single compact block: Neuromuscular Priming nastia muntean sets 1 10 1 15 new
I was unable to find specific professional or user reviews for "Nastia Muntean sets 1-10" or "1-15" in relation to a product, photography series, or digital release. Therefore, the most plausible explanation is that this