Do-In is an ancient form of movement that combines dynamic exercises with stretching. Its ancient Chinese name is Dao Yin, which translates to: "stretching and moving the limbs to facilitate the flow of vital energy." Although Do-In is categorized under complementary and alternative medicine, the efficacy of its various components is increasingly supported by scientific research.
This section explores scientific insights into stretching. Research demonstrates that its effects extend far beyond simply "becoming more flexible." Stretching does not only affect the muscles; it also has a profound impact on the nervous system, blood vessels, and even one’s mental state.
Surprisingly, stretching is not only beneficial for your muscles but also for your heart.
Lowering Blood Pressure: Recent research (including studies in the Journal of Physical Activity and Health) indicates that stretching can be more effective at lowering blood pressure than brisk walking for individuals with hypertension (high blood pressure). Stretching has also been shown to reduce arterial stiffness.
Vascular Health: By stretching muscles, you indirectly stretch the blood vessels that pass through them. This reduces arterial stiffness, which improves blood flow and lowers resistance within the vascular system.
Stretching acts as a direct line of communication with your brain.
Parasympathetic Activation: Stretching stimulates the vagus nerve, which helps activate the parasympathetic nervous system (your "rest and digest" system). This lowers your heart rate and reduces the production of cortisol (the stress hormone).
Stretch Reflex and Tolerance: Scientists have discovered that increased flexibility results not only from the physical lengthening of tissue but primarily from neurological habituation. Your nervous system learns that the stretched position is safe, thereby increasing pain-free Range of Motion (ROM).
In Eastern medicine, the focus is often on connective tissue, which we view as the physical aspect of the meridians. Science now confirms its importance:
Matrix Remodeling: Static stretching (holding a pose for longer periods) influences the composition of the connective tissue matrix. It stimulates the turnover of hyaluronan and the synthesis of collagen types I and III, which are essential for tissue repair. Stretching also promotes the resolution of inflammation as cells release signals that soothe the immune system.
Both Helene M. Langevin and Robert Schleip have conducted extensive research on the effects of stretching on connective tissues. Their publications can be found on PubMed.
Fascia Hydration: Stretching helps "squeeze out" and subsequently "re-absorb" fluid within the fascia, which improves the glide between tissue layers and reduces stiffness.
Fascia and Meridians: There is significant spatial correspondence between meridian pathways and connective tissue planes in the body. When a needle (or a stretch stimulus) is introduced, the connective tissue responds by wrapping around the needle (the "needle grasp"), sending a mechanical signal throughout the entire fascial network. Stretching the fascia (as seen in yoga) or manipulation with needles activates fibroblasts. These cells respond by releasing ATP (cellular energy) and reorganizing the extracellular matrix. This explains why a localized stretch can have a systemic effect on the rest of the body.
Somatic Relaxation: Because anxiety often manifests physically (such as raised shoulders), the physical release of that tension can send a signal of safety to the brain. Research indicates that just 10 minutes of stretching can significantly lower cortisol levels.
Body Awareness: Stretching improves proprioception (the ability to sense the position of your own body), which is essential for balance and fall prevention, especially as we age.
Academic skills: The systematic integration of yoga and meditation in education leads to significant improvements in students' concentration, emotional stability, and academic performance. By reducing stress and strengthening cognitive functions, these practices offer an effective, evidence-based method to enhance both well-being and learning outcomes within academic institutions. - Prabhu, M. K. S. (2026). Use of yoga and meditation in daily life and its impact on academic environment: A study. National Research Journal of Social Sciences, 11(Special Issue), 288-293.
Epigenetic changes: Mind-body exercises (such as Do-In, Tai Chi, and yoga) positively influence gene expression for stress regulation and neuroplasticity through epigenetic changes. These biological mechanisms reprogram neural circuits, leading to greater resilience against stress and a deceleration of cognitive aging in both healthy older adults and clinical populations. - Gu, M., Kang, J., Zhou, Y., Lin, L., Li, C., Wu, M., Fan, Q., & Tang, M. (2026). Mind-body exercise as epigenetic modulators: Rewiring neural circuits for stress resilience and cognitive aging. IBRO Neuroscience Reports, 11, 288-293.
Menstrual Complaints
Acupressure has also been studied in relation to various complaints. For example, acupressure on Liver 3 and Spleen 6 can reduce painful menstruation. A 2025 study found that acupressure is effective for menstrual pain. It works significantly better than pressure on placebo points.
Anxiety and Depression This study (a so-called Network Meta-Analysis) compares the effectiveness of various Mind-Body Exercises (MBE) in reducing anxiety and depression in cancer survivors. The study compared various forms of exercise. Specifically, Qigong, Tai Chi, and Yoga were all highly effective (between 65 and 70% for anxiety; between 57 and 65% for depression). Qigong and Tai Chi originate from Dao Yin, the Chinese form of Do-In. Additionally, many stretches from Yoga are practiced in Do-In; some even originate from Do-In. Therefore, we can assume that the results also apply to Do-In.