Yoga. learning to hold annoying poses that I suck at, and being humbled, gradually learning the value of it, instead of being upset at where I started.
Sprints with full warm up, dynamic stretches, painstaking attention to how everything feels, and long enough rest to feel like I’m itching to get back in, but I hold myself back and center so that I can use good form. Then I stop before the reps get sloppy.
Getting both knees injured, truly believing I was out of sports and training for life, and then building myself back up from wearing braces and tape and using crutches, to being more athletic and wise than ever before.
Putting on and taking off my shoes and socks while standing on one foot. Making myself change shorts and underwear in the car while keeping my shoes on, which might sound stupid, but is a really good way to force yourself to do a very arduous ankle mobility, proprioception, core, and deltoid endurance task, all while you have to avoid someone seeing your noodle, and keeping your underwear from contacting the bottom and sides of your shoes.
Twisting an ankle and learning to do boring, uncomfortable ankle strengthening drills from knees over toes guy.
Playing catch, frisbee, and training gymnastics, just BSing around with friends or by myself on the turf. Learning how to move my body, pivot, come to a stop aka blocking safely.
Learning to swim and forcing myself to regard my cadence and gradually beginning to use flip turns.
Walking lunges with a pause. Duck walking in a deep squat.