Even with the modifications, she keeps it to 30 minutes or less and doesn't do a ton of hard positions in the same practice so if you're looking for a hard workout, you'll have to add stuff yourself sometimes. There are days I was sore and didn't understand why because it seemed easy until I realized I was sweating so it's sneaky tough sometimes too.
If you are looking to add to it, I repeated day 6 a lot to get that core workout. I've also started
the 100 pushup challenge if you want to join me. I'm going Monday Wednesday Friday. It definitely makes those downward facing dogs and chataranga pushups noticable.
I am in body recomposition mode right now so I'm trying to do my yoga for overall strength and flexibility when I have 20 minutes between meetings, do some core and pushups a few times a week which is like 10 minutes here or there, and run a couple miles most days, which is like 45 minutes at night. So it's a lot of good exercise but it's all stuff I can sneak in to lulls in my day instead of hitting the gym for 90 minutes to do it all at once,