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.
If we're talking about building lower body strength and power (as opposed to endurance, agility, etc), then you really need to do things like barbell squats and deadlifts. Men and women, all ages. Walking and running do nothing to improve lower body strength.
For ordinary "functional" fitness, lots of people skip the weights and do body-weight lower body strength workouts. These are the basuc things you need to hike up hills all day. Body-weight Lunges and Squats . And although Stair Machines are usually considered a cardio/endurance activity, they are a body-weight lower body muscle stressor for sure so I consider them cardio/calisthenic if done at a good intensity.
Predictably, I come down to my usual recommendations: Do all of it: Weights for strength and bone, cardio for heart, endurance, and stamina, and body-weight exercise/calisthenics for everything.
This 15- minute set of leg calisthenics with no breaks from Mindy looks good and tough. I would find it challenging at the least. Feel the burn. An hour of calisthenics like this will make you feel great the rest of the day.
I’ve been a swimmer - a serious swimmer - my whole life. I have seriously strong legs, even tho speed and power comes 85% from arms and back. I can squat all day long. I have done weights for strength for back and arms and it has added power to swim. And helped keep rotator damage at bay. So I can keep swimming miles. My husband the very serious runner does weights for upper body strength and endurance. He does intentional weights to enhance the running that he enjoys. Not for its own sake.
NFL great Bo Jackson, with thighs as big as my waist, said that he didn't do weights. He did a lot of manual labor, calisthenics, running up hills, etc. I am not sure how true this is but then again why would he lie.