If you are looking to hone yourself: mind, body, and spirit. If you are wanting to be at peak performance at all times. If you want to be focused on what truly matters to you, execute your plans efficiently, and be agile to make necessary changes. Then you need to get a copy of The Way of the SEAL: Think Like an Elite Warrior to Lead and Succeed by Mark Divine.
The author earned an MBA and started a financial career. Unfortunately, while it paid well, it left him feeling like he was missing out. He didn't feel that he was living the life he really wanted to lead. He enjoyed and excelled in martial arts and was a student not only of the physical aspect but of the philosophy being instilled in him. Mark decided he wanted to become a SEAL. After 20 years as a SEAL, he went into business for himself and with partners. Some of the businesses worked and became very successful, while some others flopped.