Personal Training at the HATC
Train With Purpose. Adapt at Altitude.
Personal training at HATC isn’t about random workouts—it’s about building a system that works for your body, your goals, and the demands of training at 6,752 feet.
Whether you’re just getting started or refining elite performance, our coaches meet you where you are—and push you forward with structure, precision, and accountability.
Coaching That Actually Translates
This isn’t one-size-fits-all programming.
Our trainers work across disciplines to build real-world performance, including:
- Strength & conditioning
- Weight loss & body composition
- Endurance & altitude adaptation
- Mobility & injury prevention
- Combat sports & skill development
- Outdoor performance (trail, bike, snow, climb)
Every session is built to translate beyond the gym—into your sport, your lifestyle, and your long-term health.
Built Around You
Training is flexible and designed to fit your schedule and goals:
- 1:1 Personal Training – Fully customized coaching
- Small Group Training – Shared energy, focused structure
- Skill-Based Sessions – Sport-specific or discipline-driven
Everything is integrated into the HATC environment—so your training, recovery, and routine all work together.
More Than Just Training
At HATC, coaching goes beyond reps and sets.
Select trainers offer support in:
- Nutrition guidance
- Habit building & accountability
- Breathwork & recovery integration
- Performance planning
Because lasting results come from what happens between sessions, not just during them.
Meet the Coaches
Steve Seiver (CPT)
Personal Trainer • Breathwork Coach
Steve is a personal trainer, breathwork coach, and U.S. Air Force veteran whose work focuses on building strength, resilience, and performance through a deeper connection between mind and body.
His philosophy is rooted in his 3M Method—Movement, Meditation, and Mindfulness—helping clients improve how they move, regulate their nervous system, and perform at a higher level. His approach blends functional training, breathwork, and real-world application to create lasting results.
At HATC, Steve works with a wide range of clients—from everyday athletes to those looking to rebuild strength, improve mobility, or reset mentally and physically—meeting each person where they are and guiding them forward with purpose.
Alyssabeth Knerr (CPT)
Personal Trainer • Yoga Instructor • Meditation Coach
Alyssabeth is a NASM certified personal trainer, 500-hour registered yoga teacher, and iRest Yoga Nidra meditation instructor who brings a holistic, movement-as-medicine approach to health and performance. Her work blends strength training with mobility, flexibility, and mindfulness to support both physical and mental well-being.
Her philosophy centers on balance and intention—helping clients build strength while staying connected to their bodies. Alyssabeth specializes in creating personalized programs that guide individuals toward feeling strong, grounded, and empowered.
At HATC, Alyssabeth works with a wide range of clients, including special populations, integrating trauma-informed practices and mindful movement to support recovery, resilience, and overall well-being at altitude.
Matthew Padilla Stillwell (CPT)
Head Coach, Basecamp • Performance Trainer
Raised in Big Bear Lake, Matthew Padilla-Stillwell brings a rare combination of mountain-town grit, athletic discipline, and modern performance training to the High Alpine Training Club. A standout multi-sport athlete from an early age, Matthew competed at a high level in football and basketball, ultimately earning recognition as an All-CIF Linebacker, Defensive League MVP, and CIF Champion. His athletic journey later expanded internationally when he traveled to Australia to play American football, gaining exposure to elite-level training environments and team culture abroad.
Today, Matthew serves as one of HATC’s lead coaches and the Head Coach of Basecamp: Full-Body Foundational Training — HATC’s signature movement and conditioning class focused on functional strength, endurance, athletic movement, and foundational lifting mechanics. Certified in personal training since 2025, Matthew has spent nearly a decade immersed in training methodologies ranging from Olympic lifting fundamentals and hypertrophy programming to conditioning, mobility, and performance-based strength development. His coaching philosophy centers on helping people build confidence through movement, whether they are stepping into a gym for the first time or preparing for advanced athletic performance.
Tammy Ardigo (CPT)
Strength Coach • Personal Trainer
Tammy is a personal trainer and healthy lifestyle coach whose work sits at the intersection of strength, nervous system regulation, and long-term human performance.
Her philosophy is simple: true strength comes from training the body to adapt. Tammy specializes in nervous system–based strength training, helping clients build resilience, recover more effectively, and create results that actually last.
At HATC, Tammy works with a wide range of clients—from locals and lifestyle athletes to those recovering from injury or burnout—meeting each person where they are and building from there. Her sessions emphasize balance, longevity, and sustainability over intensity for intensity’s sake.