Don't wait till 2022 or even tomorrow. You need to train your mind to see good habits like exercising as something fundamental as breathing instead of a chore. Start today. It can be little as single push up or a 10 sec plank. Start tiny and work your way up. Churning out a quick 25 pushups will soon be easy and effortless in a couple of months time if you can only do 1 today.
I'm not a fan of self help books in general but Atomic Habits really changed my mindset for good.
I heartily recommend the r/bodyweightfitness's Recommended Routine (https://old.reddit.com/r/bodyweightfitness/wiki/kb/recommend...). I found it extremely reasonable, convincing, and beginner-friendly. It has detailed progressions on what to start from if you can't do a pushup or other (all the way up to if you can do it on one hand or whatever), and is absolutely not condescending, instead gives amazingly practical advice. It doesn't ask you to do more than 8 repetitions of any major exercise ever in a series, regardless how advanced you are, and there's whole ton of explanations why it's enough and why physiologically the freaking breaks between exercises are important and must not be shortened. I found it amazingly anti-bullshit yet super approachable.
It's funny you suggested that because I use the r/BWF's Recommended Routine myself. I'm big on calisthenics and wish to do one arm push up and handstand pushups someday. BWF for the win because if a gym is closed because of a pandemic or if I'm on vacation, I don't want to feel my routine being disrupted.
I want to add to this... i set a goal a while back of doing the equivalent point in duolingo every day of like 2 or 3 lessons. that didn't work in the long term and the streak went away and i lost the motivation to keep "stubbing my toe" so to speak every few days. I changed it to 1 lesson a day and the streak is almost 700 days in a row now and there is usually some motivation to do an extra few lessons or not once you get going. but just doing it and making the goals small will build those habits. I would say start really, really small in the goals and it will pay off. do 5 pushups or even if it's just one pushup it will add up and make it more manageable and more likely that you will stick with it.
I'm not a fan of self help books in general but Atomic Habits really changed my mindset for good.