Michelle Monaghan, who plays Jaclyn on the hit HBO show, has shown off her strong core in workout scenes, as well as shots by the pool while she lounges with her two childhood pals Laurie (Carrie Coon ...

Of course, rolling out a yoga mat and cracking out some crunches can help you train your abs. The same goes for completing some sit-ups. But if you’re looking for some variety, guidance, and time ...