Strength Den
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Strength Den
Our goal is to help those who are active to remain active as they get older and to help those who haven't been active to become active and to enjoy moving their bodies again. We do this through a holistic movement approach during personal training sessions. Strength Den is a Private Fitness Facility where you won't have to worry about a crowd, the focus will always be you, the student.

Here at Strength Den we believe in assessing all of our students. Finding out their goals, past workout history and any obstacles that have shown up along the way helps create the perfect personal training experience. Strength Den is a great place for those who want to become or already are serious about their health and fitness.
Services
When choosing a gym, it's hard to know if you will like it before stepping foot into the facility. We like to think we are accepting of all but we understand it is best to be safe than sorry. This is why we schedule an Introductory Zoom Session. So you can decide if we are the right fit.

During the Introductory Zoom session, we will sit down with you to discuss your health history, any past or current injuries you might have, and your specific goals.We will take this time to get to know you, learn about everything you're looking to accomplish, and what obstacles have been in your way.
I hadn't worked out at all for about 2 years when I joined a local gym two years ago that was offering a 21-day jump start program. I was 52 years old and menopause was kicking my butt. Denzel was one of the first trainers I had in the program, and he was the one assigned to me most consistently throughout the 21 days.
Reviews (15)
Courtney G.
Courtney G.
Jul 06, 2021
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I highly recommend training with Denzel at the Strength Den. I am entering my fourth month of weekly semi-private training sessions, and I am so so grateful for Denzel and this incredible fitness environment that he has created.

As a former Division I college soccer athlete, I have a history of extreme strength and conditioning training. After taking a years-long hiatus from.working out, and after having two children, I decided it was time to focus on my physical health and re-prioritize becoming physically stronger and more comfortable in my body. I was quite anxious to.make the leap, but Denzel
Brian Lanigan
Brian Lanigan
Apr 24, 2021
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Denzel is fantastic! He does an amazing job of focusing on each individual's needs and how to build strength and mobility. He is a true game changer for your fitness routine, whatever your goals.
Aileen McGoldrick
Aileen McGoldrick
Jan 05, 2020
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I have been going to Strength Den for a few months now for help incorporating strength training in my exercise regime. Denzel put a plan together for me and after a few months I feel stronger, more toned and inspired to continue on this path. Denzel is knowledge, patient and mixes it up every time, keeping it interesting. I would highly recommend Strength Den for anyone looking for personal / small group fitness training or help meeting any of your fitness goals.
Claire Conway
Claire Conway
Oct 18, 2019
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Denzel is a magician! I came in wanting to get stronger and more toned, without getting buffed and bulky, and I have achieved so much more than that! I am stronger now than I ever imagined I could be and have beaten two injuries - one from running, the other from skiing. And he whipped my posture and balance into shape while he was at it. Best investment I have ever made.
Terry Strauss
Terry Strauss
Sep 19, 2019
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I started with Strength Den several months ago and am very glad that I did. I'm confident in Denzel's knowledge of what is good for my body, how to build my strength and maintain flexibility, and I can feel the difference over time -- builds strength and confidence, while keeping me in shape.
Lisa Roberts
Lisa Roberts
Sep 10, 2019
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Denzel is a great personal trainer! I am feeling stronger already. He is clear in his communication and knows how to guide me to get the best results from the program he designed for me. I highly recommend him.
Kris Malone Grossman
Kris Malone Grossman
Sep 09, 2019
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Denzel Allen's breadth of knowledge and brilliant approach are nonpareil, and I am exceptionally grateful to be working with and learning from him, and getting stronger thanks to his expertise.
After 25 years of casual marathoning, strength training, boot camping, mountain biking, TRXing, and engaging in myriad forms of exercise (with a lot of hubristic poor-forming along the way) I've recently suffered a raft of serial injuries that took most fitness modalities off the menu. Yeah. Crummy.
Enter Denzel and The Strength Den.
I first began working with Denzel shortly after being diagnosed with
Kate S.
Kate S.
Jul 19, 2019
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I took my first group class two days ago and I'm going back tonight! Denzel clearly knows what he's doing. He's different than other trainers I've had in the past because he is super focused on proper form and is really attentive to how you are moving through the workout. The studio is super airy and open, the class is challenging but FUN and it flew by which rarely happens.
Ginny W.
Ginny W.
Jun 17, 2019
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I've been working with Denzel for 3 months to ty to regain strength after two major back surgeries a few years ago. Because my back has a lot of metal holding it together it is completely inflexible. While protecting my back I've let the rest of my body become very de-conditioned.
Denzel has done more to help me in 3 months than 10 yrs of PT, chiropractors, water aerobics, exercise classes, circuit training, acupuncture, chronic pain management groups, walking and on and on. He is slowly and competently building my body back up. Denzel pays close attention to my movements and sometimes
Honest H.
Honest H.
May 15, 2019
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Denzel's awesome! His down to earth calm and generous demeanor​ have been so helpful to almost 55 year​ old me, in just​ one month! I've been going a couple times a week for 30 minute​s with a group of women. I came in very disabled as I broke parts of my low back 3 years ago with no lasting success from PT or chiro. His custom designed super slow strength training has focused on regaining power from the core, and is offered in an affordable and peaceful setting with lots of fresh air. Thanks Strength Den!
Chloe R.
Chloe R.
Oct 18, 2018
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Denzel's workouts are truly amazing. I almost don't want to write this review because I feel like his class is such a hidden gem in Mill Valley. I always look forward to going, and keep coming back every week! The space is awesome- super open with natural light. He encourages everybody to go at their own pace and pays attention to each person in the class. I have gotten so much stronger since I started-- yet I never feel totally worn out after workouts.
Daniel Fuwa
Daniel Fuwa
Oct 17, 2018
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Denzel @ Strength Den customized a sustainable workout that is challenging but not intimidating unlike other classes I have taken. I already feel the results a few months in.
Jesse P.
Jesse P.
Oct 03, 2018
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I've been going to this class for several months now and it is the perfect workout routine for me. Denzel leads a class that focuses on the fundamentals and proper body mechanics of each exercise. It is a great class for developing core strength and really learning the technique before you dive into high reps. His intervals are short enough that they don't completely wipe you out afterwards, this is particularly important to me as a volunteer firefighter so that I can be ready to physically perform when the time is needed. I have noticed significant gains and I'm happy to be part
Alex N.
Alex N.
Sep 18, 2018
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Since my time working out at the Strength Den, my mobility and strength have improved drastically. I got shoulder surgery several years ago, and since I've been working out with Denzel, I have made noticeable strides in getting my strength fully back. The workouts are fun, and Denzel provides a lot of 1 on 1 attention to make sure that I am doing the movements correctly and effectively. I recommend the Strength Den for anyone looking to not only get stronger, but learn how to work out effectively.
Allie Lindkvist
Allie Lindkvist
Jul 27, 2018
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I'm always a happier person leaving the Strength Den! I enjoy taking the small group classes with Denzel. The workouts are challenging without being intimidating. I feel stronger and stronger since starting at the Strength Den, which I LOVE!