Guess what, construction site workers who stand all day for 2 weeks can stand without effort too.
Those calisthenics guys who train in the park even without a routine will eventually perform push ups effortlessly.
People who work construction jobs tend to suffer back pain, stiff tired or worn out joints, etc.; not the best example. Try standing in one place for 8 hours, without moving. If a construction worker had to, they would start moving around, bending their knees, walking around a bit, anything to loosen up, because their job entails moving around in a variety of dynamic movements, not turning to stone from standing still or doing one specific movement. Check with a cashier that has to bag your groceries; back pain, stiff joints, aching knees. Push ups effortlessly doesn't necessarily mean 1000 push ups effortlessly, or without wear and tear, especially if you're doing that DAILY rather than a variety of dynamic movements. The reason they do qi gong, tai chi and such in China is because they're health centric, and are relieved from pain and injury by performing the meditative movements or static meditation.
What exactly is tree qigong and push up qigong?
But before that; define qigong as you know it
Well, "as I know it", it's entering a meditative and physiologically receptive mental state while performing some practice, according to skill level (as in, what practice you can perform qi gong in), and improving your skill on an intra-physiological level (like the programming of a computer application), manipulating basic forces and even unknown and often neglected ones. So muscle rate coding, muscle recruitment patterns, blood pressure, and fluid levels would behave differently than when in normal consciousness (mindset), because you are so receptive and focused on your own performance of an activity. It's also more holistic and aesthetic, rather than the mind focusing on specifics it improves your aesthetic logic (i.e. analogic) of the body. This is already something we do, when we feel or sense qualities and changes in our physiological state and make associations of what's good to do when and where, what's bad to do when and where, etc, but that happens less often, with less sophistication and less receptively than with qi gong. We can feel more or less "fresh", "invigorated", "accomplished", "fluid", "strong", so on and so forth, but qi gong is meant to bring you in contact with more of these qualities at once and to process them more intelligently and thoroughly.
I already posted some articles on tree qi gong you can check out. Attempting to perform qi gong or meditation whilst doing push ups is similar in principle, but requires some learning and skill development like anything does when applying it to something new.
I'm pretty sure that anyone who lacks a fairly severe physical disability (and who isn't a toddler) already stands effortlessly without doing any qi gong. It's something most people master well before starting kindergarten. Does standing require any significant effort for you?
Rather rude and insulting. Can you stand in one spot for 8 hours without any pain, discomfort, and stiffness? Without walking around or moving too much at all? People who perform qi gong learn subtle techniques and principles by being receptive to their body whilst performing activities; not basically receptive, but deeply receptive (meditative). There are already clear benefits for meditation, or do you already know how to sit and do nothing? They're not the same thing at all. Increased grey matter, improved happiness, improved cognition, improved health long-term and over-all, improved focus, and a few other things are the result of meditation.
And that has nothing to do with your statement that the poster doesn't know how to do a push-up correctly, nor does anyone else.
It's a turn of phrase. If I wanted to be very literal, I would say "many people don't". People can perform a 1000 reps but stop at 500 because their knees or some joint starts hurting/aching. People can perform a 1000 reps but not every day or even 3x a week. Unless you have perfectly developed and balanced musculature and tendons, you can't naturally get that sort of mileage without wearing out the inside or outside of the tires or something breaking down (a metaphor). The remedy is qi gong. The reason is because of what qi gong is. What qi gong is, as it means to me, is stated above; as it is understood by others, you can search for yourself with some google fu. You can find some more info in the tree qi gong links I posted if you don't want to google it.