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If I can do it, anyone can!


Mark's Story

Mark C. Davis aka XBigMan describes his struggle with obesity:

Mark in July of 1991.

Mark in July of 1991.

"As you can imagine from seeing my "Before" picture, I was not a healthy, happy camper. I was 34 years old and took pills for every ailment you could imagine. Neither the doctors nor the pills were very helpful. At every appointment, the nurse would make me hop up on the scale and it would max out at 350 lbs. One nurse would yell out: "Hey we need the obese blood pressure cuff over here!" A doctor told me: "I know why you have high blood pressure. It is because you are so FAT. Have you ever tried Slim Fast?" I had tried Slim Fast (along with every diet and supplement there was) and found it to be the most useless product I had ever tried."

Mark found a more compassionate doctor that suggested he might give exercise a try.

"I purchased an exercise bike and struggled to pedal for 2 minutes a day but kept at it until I could ride the bike for a half hour. I got bored working out alone and started exercising at a gym. I also began studying nutrition and applied my newfound knowledge to creating more balanced meals. What particularly helped me succeed in this effort was my discovery that my problem wasn't what I was eating, but what was eating me."

Having taken the step to deal with the emotional side of his overeating, Mark soon started seeing results.

Iron Man Florida (2006)

Iron Man Florida (2006)

"I lost almost half of my bodyweight over 4 years and my energy increased ten-fold. I became much more productive in my work as a Certified Public Accountant, however, my employer decided to downsize what was left of me. I realized that I was being sent me a message: perhaps I wasn't placed on this Earth to count other people's money."

Mark took his next huge step. He enrolled at UC Berkeley to study exercise sciences and became an American College of Sports Medicine Certified Exercise Physiologist.

"My problem wasn't what I was eating, but what was eating me."

"I have trained for the last 18 years at the San Francisco Bay Club and have helped close to a thousand people achieve their goals. My clients have ranged from 10 to 86 years of age (and feeling younger!). Some have just a few extra pounds to manage; others face similar challenges to those I faced. I tend to gravitate towards working with the "tough cases": people who are afraid of exercise and feel intimidated."

Mark has appeared on NBC, ABC, Univision and has been quoted in the New York Times and the San Francisco Chronicle. He regularly trains for and competes in Ironman Triathlons including multiple Escape From Alcatraz events.

"Aside from being lucky enough to live in my native San Francisco with my beautiful wife and two daughters, my greatest joy is to help people who are struggling with their weight and share their joy when they find success."

XBigMan Testimonial

On Top Of The World (One Woman's Journey)

On Top Of The World

"This is a picture of me, standing at the highest peak of Africa... 19,340 feet above sea level. Less than a year before that moment, I never went to the gym, didn't really like working out and led a pretty unhealthy lifestyle.

Now my life is different. Since beginning to work out with Mark in the summer of 2000, I have become healthier, more energetic, I work out at least 3 times a week and I've never felt better in my life....oh, and I also climbed the highest free-standing mountain in the world.

Although I've worked hard to achieve my goals, it is only with the help of Mark that I have been able to achieve them. Mark is the epitome of what a personal trainer should be-he is inspirational, encouraging, realistic and most of all, he really wants you to succeed... it is this last point that has really inspired me.

Most people find it hard to motivate themselves to achieve personal fitness goals. A trainer will usually "help" but in Mark's case, because he truly cares about helping you reach your goals, you're much more inspired to get up early and make the trek to the gym or to push yourself to achieve.

Nicola On The Summit

Mark doesn't need to be aggressive or militant, never pushes you do things you don't want to and doesn't set unrealistic goals. He simply makes you believe you can do something - and you always end up surprising yourself by succeeding.

In addition, Mark has his own inspirational story to tell. However, unlike many people with similar stories, Mark does not force his story on you, make you feel like you need to do what he did, or in any way compare his life to yours. He treats every client as an individual and helps him or her to only achieve what he or she wants to achieve.

There are many trainers that I have worked out with who have gone through the motions of training you and are clearly there only because 'it's a job' for now and are probably thinking about doing something else at the time. Mark however, is dedicated, professional and if only all trainers were half as good at their jobs as Mark is, we'd probably all be healthier for it!

Thanks Mark -I couldn't have done it without you."

Nicola Mummery

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