A tight ass might be enough on its own, but yoga has plenty of other benefits that shouldn't be sold short. Just ask Michelle Williams. Since Heath Ledger's tragic passing almost three years ago, yoga has been a coping mechanism for the grief-stricken actress.

She told Marie Claire, "Yoga gave me relief like nothing else; it made me a better person and a better mother. I could come back to my daughter anew."

Our expert Dr. Dana Season, clinical psychologist and yoga instructor, highlights the mental and emotional benefits of yoga, "Yoga is comprised of deep breathing, quieting the mind and strengthening the body. Together, these elements enable the body and mind to process and move through emotional experiences in a healthy way. While there are various types of yoga (for instance, Iyengar yoga focuses on alignment and technical aspects of poses, whereas Bhakti yoga focuses on spiritual devotion and enlightenment), all forms of yoga are greatly beneficial to the mind, body and soul."

Those yoga people with their good attitudes and ripped arms. The nerve!

But having the ability to escape to a yoga class is a luxury, especially for single moms with children to watch (something Michelle learned as a single mom herself). Recognizing this, and wanting to make yoga more accessible for other moms, Michelle recently started the Yoga For Single Moms Project. She explained, "The idea behind the program is that if you can clear the time, we do the rest. It provides childcare while the mum is in the yoga class, and it's all free." Four bankers probably just dropped dead from reading that. Yes, it costs zero dollars.

Someone watching the kiddos for free? Sounds like enough of a stress reliever in and of itself to give yoga a try. Even if you don't like it, you'll have an hour to nap :)

Yoga for Single Moms is launching its pilot program in Boston, with Brooklyn, NY opening next. You can monitor their site (yogaforsinglemoms.com) to see when a class comes to your area, or to request a class near you.

Or, you can just show up at Michelle Williams' door and ask her to be best friends and drink mimosas and exchange beauty tips...not that we've ever considered doing that.