Cyclists can squat huge amounts of weight for their bodyweight. But they'll feel sore like hell. The downwards movement of the legs they're so used to is how they've developed their strength; the upward movement doesn't give much resistence. Translating that into the squat, when you're in the...
You could develop more on certain routines, types of exercise and volume, but sometimes it's a mattter of personal preference and of what your goals are.
Have you tried millet, buckwheat or amaranth? They are great gluten free carb sources whether whole or powder. They're as high or higher in protein than oats.
It's like creating a habit. You had to create the habit of start working out. When you stop, you can always go back. We are inherently lazy beings, so make it your goal to go back without any superhuman expectations.
Watching videos is fine, it gets you motivated, but better than having a short...
I remember when I was running 5-6 days a week (coming from a 3-4 day). My knees and joints didn't hold up well. I was in my early twenties back then but it was tough on the joints in either case.