Keeping things basic is the way to go but don't always look to them as a generic boring thing. Make the basics interesting, make games out of them and have fun while kicking your ass. Daily training and being smart about what you do will make all the difference. If you're more keen on doing things 3-4 times a week, that's great too, just don't fall for bullshit that'll get you hurt or worse.
Building muscle at 40 these days isn't surprising or as shocking as it was back in the day but it's still incredible that people can still accomplish it and continue their journey. For me, it's becoming more and more of a realization that the more you can make it happen and without TRT, HGH, HRT and other things that many even as young as their 20's are doing, is something to celebrate and be proud of.
Old school methods are what keeps the world going around when it comes to Fitness in the long run. Been doing it for ages but there's always been fluctuations in terms of what my physique has gone through over the years and I blame no one but myself on what some of those fluctuations entailed. The best thing to do is to keep improving, making better decisions on the type of training you do and getting the most out of it. Some may say Daily Hard Workouts will get you better results but some of those same guys look like Bean Poles and have less muscle than Karen Carpenter (bad joke I know). I say, do what you can and go hard when needed, go hard for too long, too frequently, it can bite you in the ass.
There was a reason I fell in love with training and it went beyond my accident and all that, you already know the story by now so you don't need me to repeat it like a broken fucking record. It's the love of doing things that mean something, that are valued and making adjustments. Doing 500 Push-ups and Squats are great for some but there are plenty of things that don't require hundreds or thousands of reps in one shot. Play it over time and spread them out. If anything I do 500 these days is Step Ups or a total of 500 doing 5 exercises for 10 reps each for 10 rounds doing Circuits with my Dopamineo Band. The rest of the time, I'll do lifts with the sandbags, work on isometrics, consistent deep breathing training with the O2 Trainer and play with the hammers, chest expander and other kick ass equipment I got laying around.
Working on bodyweight training is always fun to do especially when you learn from people like Matt Schifferle of the Red Delta Project. Guy's knowledge and applications of movements are so freaking awesome, it's shameful he's not ranked up there with being one of the very best in Physical Culture today. His method of Grind Style Calisthenics and Isometrics brings that old school mentality with a humble notion of encouragement in the modern age is refreshing.
Keeping the grind going and putting up content of Push-ups, Pull-Ups (Suspension), Sandbag Work, Bands just keep getting better and better man. My physique is changing for the better as well and losing weight has been a great blessing. When I turned 40 back in late July, I was already down 17-18 lbs within the last several months since my recovery from that fucked up Sciatica injury which I will aways take responsibility for. This time around, I'm down to roughly 230 lbs and the muscle just keeps packing on little by little. Often these days I take a longer time to eat during the day, only eating when I'm hungry and consistently eating Meats, Eggs, Rice, using the Air Fryer and other things. Still have my vices like pizza, fries, burgers (not always fast food), Burritos, Pasta and sandwiches from Subway or this little place here called Local Deli where even half a sandwich looks huge yet still losing weight and dropping bodyfat. Haven't had Burger King in months and been more than a year that I can remember having McDonalds.
When you put in the work but keeping the stress to a minimum, things will pop up for you and being consistent with your eating habits and training smart and not like a maniac frequently. It's good to go crazy a couple to a few times a week but don't push to where you're so sore, your muscles are screaming at you "You are a fucking asshole for doing this to me." Have gas in the tank, make little progressions and keep your mind sharp when you train, even on those days when things around you suck. Don't go overboard with the junk stuff but don't have to 100% cut them out of your life either unless it's dire and need to clean things up.
Training at this age and beyond is crucial and valuable but don't make it so that you're going to act like a dick and tell people how much of a loser they are if they don't train. Be more encouraging, share your progress and utilize what gives you the greatest benefit in your journey. Calling people derogatory names because they don't do pull-ups or some shit like that makes you more of the loser than anything else. Do many these days need a tune up in their health, absolutely, but preying on their insecurities and mocking them with such vengeance is such a copout and just downright mean bro. Being a goody too shoes isn't ideal either so it's important to find a balance of being encouraging and giving people a reason to train and giving tough love when needed. It's hard enough when the biggest critics is ourselves.
Stick to the basics as much as possible. There will be days where things aren't always there and the chaos of life just throws you curve ball after curve ball, don't give up and do a little something even a few push-ups or holding a few postures during commercials while watching your favorite show and if you got a streaming service, pause the movie for a little bit and do a quick mini workout that can be as short as a few minutes like this Core Workout, it's not easy but it'll do some good in a span of 4 minutes. You got this and keep your journey alive. Be amazingly awesome.