Sonic Endurance
Train Smart. Race Bold.
Belong to Something Bigger
|
Sonic Endurance is dedicated to helping athletes of all abilities achieve their endurance goals. We understand that no two athletes are alike and the response to training is an individual process. We regularly incorporate field-based testing and functional movement testing in order to assess an athlete’s progress towards their goals. It is our mission to develop a plan that uses your training time efficiently while preparing you to accomplish or exceed your goals.
Endurance Coaching for Every Athlete
Sonic Endurance
Personalized Training
Unlock Your Potential
|
It all begins with culture—and Sonic’s culture stands above the rest. Coaches and athletes unite as a team, supporting one another through training, overcoming challenges, and pursuing personal goals. At the heart of Sonic’s success are acceptance, mutual respect, and a deep appreciation for each athlete’s individuality. The coaches are not only highly knowledgeable but also genuinely invested in helping you achieve your goals.
Through strategic partnerships with athletic trainers, physical and occupational therapists, training camps and trusted vendors, Sonic ensures every aspect of your training experience is optimized for your success.
At Sonic, every finish line marks a victory over your personal limits.
I signed up with a Sonic coach to improve personally as a triathlete, and almost immediately I started training smarter. I was working harder in many sessions, but I was also less tired overall at the end of the week. I was meeting my primary goal of sustainable fitness for years to come, and as a nice bonus my race times improved dramatically!
But more importantly what I have gained from Sonic, which I didn't know I needed, is a culture of community and support. This is a team focused on affirming each others' wins no matter what they look like, providing support through successes and challenges, and generally bringing a positive attitude to endurance sports. I came for myself, but I'm now proud to be a part of this team team!
My Journey all start in the summer of 2021 when I found myself unhappy with my current fitness level. I had not seen a gym in roughly 10 years, or even attempted any type of cardio workout. I set my goals a bit high without really knowing what I was getting myself into. I registered for my first full Ironman in Lake Placid! In this process I found Sonic Endurance and started working with Maribeth. One of my first times meeting Maribeth, was also my first time EVER swimming in a lap pool, and it showed! Maribeth evaluated my skill level, and spent countless hours teaching me how to swim, while improving my technique and endurance. Swimming was my absolute biggest challenge of the three disciplines. Maribeth was always available for encouragement, support and a good laugh throughout my journey. Working with Maribeth not only kept me accountable, but without her, my goals would not have been met. From Swimming, biking, running to fueling properly for races, Maribeth was there every step of the way. I have continued to work with her as my Endurance coach now for 4 years and have never felt more accomplished in my endurance goals! Working with Maribeth and Sonic has given me some of the best years of my life, the value of working with Maribeth one on one is priceless. Forever grateful!
Joining the Sonic Endurance team and being a 1 on 1 coached athlete has been a life changing experience. I achieved goals I never even dreamed of, including my first full Ironman finish. Coach Stacey gave me the confidence to sign up for Ironman Lake Placid and with her guidance, I never once thought I would not finish. On top of that, the Sonic team has literally become some of my closest friends and chosen family.
Sonic Endurance is more than a coaching company.
Sonic Endurance is a collection of like-minded individuals
Sonic Endurance helps athletes of all abilities reach their endurance goals, from a first sprint triathlon to a full Ironman. Every plan is built around your schedule, fitness and goals, and checked with field-based and functional movement testing so your training time counts. We coach in person around Lansdale and the greater Philadelphia area, and remotely through TrainingPeaks for athletes anywhere in the U.S.
. We train, we race, we fail, and we succeed. We understand what you experience throughout your seasons of training and racing because we are right there beside you, on the same journey.
Through years of training, racing, and coaching, we’ve learned our athletes benefit most from a team approach. We each bring something different to the table and want you to benefit from each perspective. You’ll have your 1-on-1 coach, combined with the knowledge, experience, and expertise of all our coaches. Together, we bring our passion for triathlon to coaching in support of your goals and behind the process of uncovering your potential.
Sonic Endurance
Our Mission & Vision
Our Articles
The Largest Growing Age Group, considerations for training in your 20s
Last year, USAT published statistics that reported that the largest growing age group in sport was 20-29. In their research, it also showed that they were not staying in sport, or racing more than one event. Your 20s are the best decade for building, but not necessarily for peaking. Recovery is fast, injury risk from age-related wear is low, and you have years ahead to build a solid base for fast racing. The mistake most 20-something triathletes make isn’t lack of talent or effort; it’s spending that advantage on the wrong things. We know, you can build a bot to crawl your strava and myfitness pal and spit out exactly what it thinks you should do in training. You have always had technology and google for immediate answers. It doesnt mean these methods are the most effective at getting you to a start line. You’re Building an Engine, Not Chasing a Number It’s tempting to measure everything in your 20s by this season’s result. But real triathlon development is a multi-year project, and most athletes badly misjudge the timeline in both directions: they overestimate what’s possible in the next 2-6 months and underestimate what’s possible over 1-3 years of consistent training. They are not sure what they really need to show up to the start line because they do not have the experience of racing endurance events. A more useful question than “How fast can I go this season?” is “What am I building this season that makes next season better?” Base Volume Is the Highest-Leverage Investment You’ll Ever Make Aerobic base is built primarily through large volumes of easy, zone 2 work over months and years, not weeks. Most athletes underestimate how much time it takes to build a suitable base to support higher intensity workouts. A 12-16 week base period is the normal range, with volume increasing gradually so the body arrives at the build phase with a genuinely deep aerobic foundation to build sharper, race-specific work on top of. Your 20s are the ideal window for this because recovery is fast enough to absorb high volume, and there’s no rush to convert that base into performance immediately. Athletes who skip base work to chase early intensity tend to plateau earlier and get hurt more often, however, athletes who bank years of aerobic development tend to keep improving well into their 30s and 40s. Additionally, do not rush the recovery. Running an ultra marathon two weeks after an Ironman can be a recipe for disaster. Enthusiasm Outpaces Recovery Capacity More Often Than You’d Think The most common mistake in this age group isn’t insufficient motivation, it’s too much of it applied without structure. Triathlon combines three disciplines, and the temptation to push hard in all three simultaneously creates a training load that’s easy to underestimate. Endurance athletes are at elevated risk for overtraining syndrome precisely because the fatigue accumulates across swim, bike, and run in ways that are hard to feel day-to-day until it’s already a problem. A few concrete guardrails hold up well across the research: increasing weekly training load by no more than about 10%, avoid high-intensity or high-volume sessions on consecutive days, and leave 2-3 days between hard efforts for recovery. Rest days are just as important as key workouts, since that’s where the adaptation from the previous hard session happens. Skipping your rest days allows fatigue to build up quickly and can lead to injury or burnout. Build the Body That Can Absorb Triathlon’s Repetitive Load Cycling and running are both repetitive, largely sagittal-plane movements, and triathlon stacks them on top of each other. That combination creates muscle imbalances — commonly weak hips, glutes, and core relative to the quads and calves doing most of the work — that don’t show up as a problem until training volume climbs. Strength work that targets the whole body, not just “core stability,” addresses this before it becomes a nagging injury rather than after. This is a case where doing the unglamorous thing early pays outsized dividends. Twenty minutes of strength work twice a week is cheap in your 20s. Ignoring an imbalance now can become a recurring injury that doesn’t allow you to reach your full potential. The Real Advantage of Your 20s The physiological edge is real, but it’s also finite and easy to waste. The athletes who make the best use of this decade aren’t necessarily the ones with the best race results at 25. They’re the ones who used their 20s to build an aerobic engine, establish good training habits, and use strength training to prevent injury. A single great season is nice to have, but consistency is the key to a long and productive triathlon career.
While the World Watches Kona, Celebrate Your Own Journey
Every athlete who races in Kona has a story of setbacks, disappointments, and obstacles they had to overcome. The difference isn’t that they faced fewer challenges. It’s that they continued moving forward despite them. The same is true for every athlete reading this today.
Build The Engine – Becoming a Sonic Team Member in 2027
A new race season is right around the corner and Sonic Endurance has open arms for you to join us in 2027. Sonic Endurance is an amazing community of like-minded athletes of all shapes, sizes and abilities from across the country