Disclaimer before we start: There are clinical markers used to determine whether an activity qualifies as cardiovascular exercise. These include heart rate, oxygen consumption, and subjective measures such as the Borg Rating of Perceived Exertion (RPE) and the Talk Test. For this conversation, I'm going to focus on the subjective measures because I doubt your Pilates studio has you hooked up to a VO₂ max analyzer while you're doing Single Leg Stretch. 😂 And with that discla