(+) I really enjoyed this book and it did motivate me to exercise more while listening to it! I appreciate that Lieberman recognizes that how much/what type of exercise is most beneficial is different for everyone and dependent upon many individual factors. It is always refreshing and believable when a scientist says we don't know exactly. Basically some exercise is better than none so do something active that you have fun doing!

(-) I have this issue with many books that touch on obesity. Often scientists point to the fact that obese patients die at greater numbers with heart attacks, diabetes, etc. and Lieberman does as well(although I appreciate he did dive into the concept of people who are within "normal" weights but have extremely high blood pressure, blood sugar levels, etc.). I have an issue with this type of analysis because, from reading some great books from self described fat women, it has been come clear to me that often doctors do not treat fat patients with the same respect and care they do skinny ones. I'd love to see some research on how this effects mortality rates - it stands to reason that if you feel not welcome at the doctor, you won't go as often OR if you do go to the doctor but are not listened to and everything is attributed to your weight, this is going to impact your health negatively. I'd really like to see research on if the higher mortality rates are due to the extra strain weight puts on your body OR due to the difference in healthcare. Realistically, it's probably a mixture of both but this issue is alot more nuanced then many people portray it to be.