@efa2e20e well I suppose both are possible.  

Frankly what I am saying is that be it kettle bells or whatever … no matter how savage….    It’s not the same thing as living life in nature.   My son is x recon marine and a beast of human.   But… two years later as a flight instructor you put him out here with me clearing fences or planting  …. He’s sore as hell the next week because the gym is the gym and nature is hard.   That said he could crush my neck so kettle bells are manly.