Maybe you need to ask her to start carrying some weight around the house in respect to your kids. But that would be confrontational.
Since she already asked you to get hobbies and stuff i would tell her that you want to make time to hit the gym/take classes/whatever X times a week. Whats the best day/ times she can make it home from work to look after the kids.
Me31 W31 M11yrs S6yrs 23Mar16-BD 9Apr16-W admitted EA w boss. 27Jun16-W Changed job and promised NC w OM. 14Jul16-Continued contact w OM.Start of Separation. 24May17-Divorced.