If you are looking for these videos specifically, they are behind a paywall and require a redemption code
It seems you're referring to a specific post or video collection from 2021 related to (likely referring to Dr. Jacques Rumack, a figure in point-of-care ultrasound education, or possibly the "Rumack" as in the Rumack & Sirlin ultrasound physics/resources). rumack ultrasound videos 2021
Dynamic clips illustrate the standard four-chamber view, Left Ventricular Outflow Tract (LVOT), and Right Ventricular Outflow Tract (RVOT). If you are looking for these videos specifically,