I was hoping to get some advice/input on a problem my husband and I are having. Sorry it's long, it's a lot to explain!

I started back at work in January from my second mat leave and things have been going quite well. Better than I expected actually, as it meant my husband really had to step up his game in helping with the kids, which he has done quite well with.

We are having a problem though and it's starting to cause a ton of tension in our relationship. My husband is extremely into crossfit. I thought once we had kids, he would slow down on the amount he goes to the gym, but he goes even more now then before we had kids. He is typically in the gym 5 days a week for 2-3 hours a day if he is working a 6 day week. If he's working a 5 day week, he's in the gym 6 days for 2-3 hours at a time. In addition to this, he might also go to a track and do running drills for an hour once a week if he can squeeze it in. 3 hours at the gym would be on the high end, 2.5 hours is pretty standard.

I feel like I'm pretty supportive of this. I try not to say anything if he goes on a day off and takes away from the small amount of family time we have together. I work a rotation, so it only lands that we get a day off together 2-3 days a month. I also work split shifts, so if I'm working and he's off, he goes while I'm home on my split. That works, but again, is the only time we really have together.

My issue is this. If we are both working, ( which is about 8-12 days a month) the girls are in daycare from about 9am until he picks them up at 545pm. Almost every day the girls are in daycare, he picks them up at 545, then has one of his parents come over at 6 so he can go to the gym. This means the girls don't see any parents all day. I go to work before they wake up and I'm not home until they are in bed. His parent will put them to bed before he's home, so they don't see him.
This really really really bothers me. I feel like if they are in daycare, they should at least spend the hour or two after daycare with a parent.
My husband has also spent a chunk of money getting equipment for the garage, so technically, he could do his workouts in the garage after he puts them to bed. He doesn't like to do this because he says when he drops the weights, he could wake up the girls. Plus he doesn't have all the equipment he might need for the workout. But, he has enough he could do enough to get a good workout in.

I told him (again) that this really bothers me. He says he works a stressful job and he deserves to have time to himself to work out his stress, plus his parents get to see the girls.

I want to know if I'm being unreasonable, or if I'm correct in thinking it's unfair to our girls not to see a parent all day. I feel like our girls should be our priority, and as he can work out at home, that that's a good compromise. Then maybe leave the girls maybe once a rotation with his parents. ( So in a set of 10 days 6 of those days he could go to the gym, and 4 he would be home. )

Any insight?