Yin Yoga

The most obvious difference at the practice level between Yin Yoga and Yang Yoga (various forms of Hatha Yoga) is that in Yin we do not activate the muscles by maintaining the asanas. In this way, we can directly affect the body's connective tissues: tendons, ligaments and fascia. These "yin" tissues are more rigid than the "yang" tissues, such as the muscles, which are more elastic and respond better to rhythmic and repetitive movements. By applying pressure or traction for a longer time on tendons and ligaments, we bring "juiciness" to the joints, as the fluidity of their synovial fluid is regenerated.
Yin Yoga is based on Taoist philosophy, where the cycle of life has five seasons associated with five elements, with two predominant internal organs per season/element. The internal organs are connected by a network of meridians or electromagnetic channels that conduct energy throughout the body. Both the meridians and the internal organs can be energetically harmonized through Yin Yoga asanas. The postures held for several minutes affect the tissue called fascia, where the meridians are located, thus helping to stimulate the flow of vital energy or chi in these channels (as in acupuncture) and generate more health and vitality for the internal organs.
And as we know, a healthy body and balanced emotions invariably bring greater peace of mind.