I never thought i'd end up posting on here but after attempting to engineer the most efficient cardio routine possible according to real scientific research (the goal is reaching around 95% max rate during the cardio bits and not getting out of zone 4-5 without injuring yourself) with my friend on here i thought since i'm pretty heart horny and bored working at home for hours the last few months i'd try and test it on myself. It entails constantly alternating between a minute of cardio - first burpees, then once i get too tired - jumping jacks, and a set of calisthenics, in my case crunches and weighted push ups. Since i usually only do steady state cardio and i already have a huge heart rate range (my resting is currently in the high 50s - low 60s in the morning and my max is in the 200s if i run uphill) and used to be in the 40s before all this started with my thesis and trying to win a prize for it, it has a huge effect on me (funnily enough i could probably do more jumping jacks and crunches/sit ups for ages but that's really boring and misses the point of the workout where you're supposed to alternate between pushing yourself hard strength wise and cardio wise and at a certain point my arms just give up with the added weight, i guess i could try shorter sets next time to delay the inevitable failure), and i barely last 20 minutes lmao. So here's a recording of my heart doing around 180 after the last set of jumping jacks today.

Pressure safety