Which of the following is primarily a benefit of hydro-friction?

The primary benefit of hydro-friction lies in its ability to promote increased circulation and stimulate the skin, enhancing overall tissue health. It is important to note that hydro-friction can create a mild abrasive effect on the skin, which helps in blood flow and lymphatic drainage. This stimulation assists in the healing processes and improves skin tone and texture.

While the antiseptic properties of water can contribute to cleanliness and prevention of infections, they are a secondary benefit compared to hydro-friction’s primary effects of improving blood flow and skin stimulation. Hydro-friction also supports the health of the dermis by energizing the area and can help alleviate minor aches and discomfort. This makes option C a reasonable interpretation within the broader context of hydro-friction's benefits.

In contrast, options that mention decreases in blood circulation, increased nerve tension, or reduced skin elasticity are contrary to the physiological effects of hydro-friction, as the technique actively enhances circulation, relieves muscle tension, and promotes skin strength and flexibility.