18 mo has breakfast with DH before he goes to work, then we play/read books together for about an hour and a half, I'll then do a home workout in the living room whilst he plays with his toys alone in the same room. He usually comes over and jumps and down and tries to copy Joe Wicks with me too 
Anyway once I've had my workout, I put CBeebies or something on for toddler and go for a shower. I'll leave him watching TV, go for a quick shower, pop down check he's ok, go back up and dry hair, go and check then go and tidy upstairs. He's always just sat enjoying his 15 mins of tv on the sofa. All doors open so I can hear him/stair gates shut. Then I come downstairs, we put some music on and play, dance, sing whilst doing the boring laundry bits etc before having lunch then toddler has a nap and I'll watch a bit of TV, we'll go for a long walk once he's up then come home and do dinner. We do this everyday, and it works for us. I really struggled with being at home so much and felt really isolated, but this works.
Anyway DH popped home unexpectedly today whilst I was in the shower. I heard the door go so dashed out the shower and downstairs. He saw me coming down in a towel and DS sat on sofa watching CBeebies and dramatically grabbed our son and said how dangerous this way, and what on earth was I thinking leaving him unattended. I said I come down every 5 mins and can hear everything, hence how I heard him come home, but he was just shaking his head at me and saying I should know better.
It turned into a bit of an argument, and he then started sniping about how I need to give toddler more quality time, I shouldn't spend the time he's awake doing chores and exercising just so I can watch TV during his nap. I disagree, I don't get much me time to just chill out and I don't see why half an hour of him playing/jumping around whilst I exercise is bad for him, I don't see how following me round whilst I do chores, get him to help 'tidy up' and 'load the washing', we count things whilst we do it, we have music playing and little dance parties. Not to mention before any of this we have an hour and a half of no phones, music, TV, just one on one play time and reading.
Kind of two separate points here,
AIBU to not bring toddler into bathroom whilst I shower?
AIBU to do household things/exercise whilst he's awake so that I can have one hour of TV or mumsnet when he naps?
We'd just gotten into a good routine that works for us both, and I felt so much better mentally for getting active, keeping the house clean and still getting a little bit of me time and now I'm just frustrated that the routine I've found myself best in is inadequate parenting.