How important do you think these two are and whats your regiment if you have one?
Possibly, how important do you think flexibility is; in arts that aren't similar to Changquan
Ah incredibly important. But both subjects are so relational that you really need to tread with caution. What helps one grow may destroy with another.
Keep in mind with everything I say I am 22, 110-120 pounds, and 5'5". I may have another growth period in store, so with change of form, so many the function change as well. For now this is what I do;
I have trained across a fair number of styles, and the injuries I've seen most common seem to be most relational toward stretching which harms. The one where you tuck the leg behind, and have the other extended, I believe if done for longer than 5 seconds is the direct cause of most ACL tearings. I'm not entirely sure why, but in TKD that seems to be the most common non-striking related injury, and I've noticed it only occurring in schools which do that stretch. I do it... but because I'm wary of it, do it for half the time I do other stretches.
I follow a personal mantra of... "Stressing is good for it causes forced growth, while pain is destroying. If you subject yourself to destruction, how can you grow, which is the essence of improvement?"
In essence; I feel if you're feeling pain, you are working against what you are trying to achieve. Healing requires who knows how long, whereas stressing, discomfort, is a sign of incremental growth. The problem is no one is patient enough, and feel they gotta force it. Some kind of pissing contest with themself, or with others in their school.
I've seen stretching done for increments of half an hour, 15 minutes, 10 minutes, 5 minutes, 1 minute, 30 seconds, 20 seconds (most common). I have long suspected that biology follows its formal function; I.E. our ancestors probably did not constantly work out in gathering food, but because were omnivores, and occasionally hunted, would probably end up exercising the limits of their bodies only a few times weekly. As is the case, while long work-outs are condusive, I've found 4-5 ten to fifteen minute workouts per day to be the best for me. I also practice breathing.
I think the most important stretch, and most underappreciated is known as the butterfly stretch. I can kick vertically with a front kick, I believe it to be because of this kick. I've certainly NEVER had a full front split. Which on the note of; I think the split is actually useful for one thing; posterity and show. Being as I can kick vertically, and lock my leg for pretty much as long as I want, I can tell you that the only time I've needed the ability of ease of splits was when visiting new or past schools, and I was forced to do a split passed my point of comfort.
I don't think diet is actually important unless you are actively ill or injured. I... eat way too much Mcdonalds, and I am very physically fit. I can also tell you though that I eat perhaps once a day, and no more than a few pounds of food at that. My parents worry haha, but I am very physically fit and can endure. I figure when I enlist and am given piss poor military food, and when I'm in the special forces (someday, if I hopefully qualify) it'll come in handy to have taught the body how to maximize its energy intake from food consumption when they're making me drink practically stagnant water.
People's physiology is both so similar, and so diverse, that I've come to reason that how we train, while in certain ways can be improved by intake, is largely a mental thing. The brain is both a computer and alchemist of sorts. It knows exactly what to release, and if it cannot do so, will inform you through a variety of means either why, and given you a sense of what is required. If your muscles are fatigued from use, your body lets you know through chemicals to rest. Likewise, when it comes to training, the brain is more than capable on its own to produce what's required to train with, with practically anything you consume. Ultimately energy is just energy to the body, and is why I can do 47 consecutive kicks with one leg, without fatigue, while having had 3 hours of sleep over 2 days, and eaten one grilled cheese sandwich.
It is mind over matter to a point, but I wouldn't worry about diet unless you have legitimate health problems, bad habits, or tendencies and susceptibility toward both. For example, if you had AIDS, I'd tell you to watch you diet damn close. Get sterilized food, etc. It's different for everyone. Just keep that in mind, while concerning yourself with yourself.
I also, preferably, sleep between 4.5-5 hours a night. I try to get two REM cycles in. The worst thing you can do is wake up in the middle of a REM cycle. Wrecks my day.
I stretch in the morning; the release of endorphins gives a morning high which I feel basing the rest of the day, and training period off to be beneficial.
My input; I hope that helps.
And yes, I really do this everyday.