We are a commune of inquiring, skeptical, politically centrist, capitalist, anglophile, traditionalist New England Yankee humans, humanoids, and animals with many interests beyond and above politics. Each of us has had a high-school education (or GED), but all had ADD so didn't pay attention very well, especially the dogs. Each one of us does "try my best to be just like I am," and none of us enjoys working for others, including for Maggie, from whom we receive neither a nickel nor a dime. Freedom from nags, cranks, government, do-gooders, control-freaks and idiots is all that we ask for.
Fitness people often refer to "metcon" workouts. These fall into our Calisthenics category, provided the Calisthenics hours are high intensity with only several seconds of rest time.
Why term it "metabolic conditioning"? It sounds cool and technical, and it does stress and thus ramp up all metabolic systems and puts every muscle in the body to work including the heart.
Most typical calisthenics classes (Cross-train cardio classes, Athletic Conditioning classes, HIIT, HICT aka High-intensity circuit training, AMRAP, TABITA, Crossfit, etc) have goals of building energy and cardio endurance instead of pure strength, with agility, speed, muscle-toning, and general athleticism as side benefits.
If a newbie wanted to "get back in shape" with a simple program, I would recommend 4- 6 of such classes/week before doing anything else if they could handle it. For 99% of people, classes will push you harder than anything you do on your own. For the first few months you will struggle and perform terribly. Endurance builds gradually. If you begin a bit chubby, the classes will be a strong motivator for nutritional rationality because extra fat makes all calisthenics more difficult than they already are.
Although we are believers in weight training twice-weekly for a number of reasons, we see many people in excellent shape whose only fitness work is a near- daily high-intensity calisthenics/metcon class.
For newbies who can not handle a 50-60 minute calisthenics class, spend a couple of months doing ordinary "cardio" to get moving. Then add in the calisthenics, and finally the powerlifts because at that point your body will be prepared to face them.