I'm a big fan of both physical and mental strength, and this book has an intriguing combination of the two. Mark Divine's 8 Weeks to SEALFIT.
Here's a comment from the Amazon page to give you a taste :
Jumping into this program taught me something really important: you cannot HIDE from the work required here. I've been doing more traditional weight lifting and strength programs at the gym over the last many months, and while the plans and programs have gone rather well for me, in just six days of working on this program I realized that I hadn't been giving it my all, and I'd been cutting corners. With 8 Weeks to SEALfit, if you stay committed to the work in front of you, you can't hide. And that's a great thing.
Good stuff. 8 Weeks to SEALFIT.