@christineleex3 I went through something similar. I used to play roller derby, do CrossFit, run, I loved it all.
Since the pandemic started I have had two cross country moves (one not by choice), lots of traumatic stuff happen, and deep trouble depression.
Oh, and I gained 80 lbs.
I kept thinking that if I "just start" again with the gym, everything else would fall into place. The starting was hard. My endurance was terrible, my body was so different than before, and on top of that I am now in my forties.
I'd get a lot of momentum, then something would disrupt it. Then I'd have to start over, again. I'd be super excited about a goal, then poof, now I had COVID. And on and on.
I'm somewhat settled now, I found a Crossfit gym that I like, and even though I am now so big and heavy that I walk differently, I keep going.
Everything is cumulative. Every time I stopped for whatever reason, my next "starting over" was easier. Your body remembers so much if your workouts, your training, your efforts. It really will play along once it has a few sessions to remember what's going on.
Like others have said, any increment counts. During the pandemic and when I was also grieving my mother who died unexpectedly, I found a couple of super basic things I could do in my kitchen. Just 2 minutes of work per day. It all made a difference.
Just show up, even if you show up, and immediately turn back around and go home, that's a win. 90% of the battle is getting into the building. In fact, my workout partner from years ago and I sometimes had to call a day's session "this is a we're in the building" workout. We'd do something milder and call it a day. It all adds up. Your body appreciates the effort.
One last thing... I need a lot more sleep than I did 5 years ago. I went through a lot of shit, and with hard workouts again, my body just needs more rest. Making extra time for rest and sleep might help you transition into workouts smoother. It's made a difference for me.
Lots of love to you.