What services does Stilwell Health & Fitness offer?

We offer personal training, chronic pain relief, injury recovery, pre/post surgery rehabilitation, and nutrition coaching. Our certified Muscle System Specialists build customized programs that target the root cause of your pain or movement problem — not just the symptoms.

Where is Stilwell Health & Fitness located?

We are located at 475 5th Street, Arcata, CA 95521. We serve clients from Arcata, Eureka (10 min away), McKinleyville (5 min), Fortuna (25 min), and all of Humboldt County.

We are open Monday through Saturday, 8:00 AM to 7:00 PM. Call us at (707) 798-0512 to schedule.

Do you offer free consultations?

Yes — we offer a free consultation for all new clients. Call (707) 798-0512 or submit our online form and we'll reach out within 24 hours to get you scheduled.

What is a Muscle System Specialist?

A Muscle System Specialist is a certified professional who uses a systematic assessment to identify exactly which muscles are causing your pain or limiting your movement. Unlike general personal trainers, we find the root cause first, then build a targeted corrective plan — so the results actually last.

Can you help with back pain, knee pain, or post-surgery recovery?

Yes. Chronic back pain, knee pain, hip issues, and post-surgical rehab are among our most common specialties. We work alongside your medical team and use corrective exercise to restore function and eliminate pain at the source.

How Aging Changes the Way We Stand Up: Insights from Biomechanics Research

Standing up from a chair seems simple, but this everyday movement reveals a lot about how our bodies change with age. A 2023 systematic review published in *Clinical Biomechanics* analyzed 17 studies involving 343 older adults and 225 younger adults to understand these differences. ## Key Findings Researchers discovered several important differences in how older adults perform the sit-to-stand movement: - **Slower overall movement time** compared to younger adults - **Greater trunk flexion** (more forward leaning) to compensate for weaker leg muscles - **Increased postural sway** once standing, indicating balance challenges - **Higher muscle co-activation** around knees and ankles to stabilize the body - **Reduced ankle torque** and lower ground reaction forces, especially during faster attempts ## Why This Matters These changes represent compensatory strategies. When knee extensor strength declines with age, older adults lean forward more to generate momentum. While this helps initiate the rise, it creates instability once standing—which then requires extra muscle effort to maintain balance. This creates a cycle: weakness leads to compensation, compensation leads to instability, and instability increases fall risk. ## Practical Applications For fitness professionals and clinicians working with older adults: 1. **Assess trunk control** during sit-to-stand movements as part of functional evaluations 2. **Target knee extensor strength** to reduce reliance on compensatory trunk momentum 3. **Practice controlled sit-to-stand** at various speeds to improve neuromuscular coordination 4. **Monitor balance** immediately after standing as a key indicator of fall risk ## The Bottom Line The simple act of standing up from a chair is a powerful window into functional aging. By understanding these biomechanical patterns, we can design better training programs that address the root causes of instability rather than just the symptoms. ## Reference Sadeh S, et al. Biomechanical and neuromuscular control characteristics of sit-to-stand transfer in young and older adults: A systematic review with implications for balance regulation mechanisms. *Clinical Biomechanics*. 2023;109:106068. [PubMed](https://pubmed.ncbi.nlm.nih.gov/37639862/)