Can Jostling cause skin sagging?

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Thank you ! regards

The impact of running on the face is not a contributing factor. If moderate impact activities had the capacity to alter facial soft tissue durability, the long distance running and endurance athlete communities would produce a large population of people with pre-mature facial aging.
However, body composition changes do effect our faces. Cyclical weight changes can accelerate facial aging.
Knowing your age would be helpful for answering your question. If, over the last 5 years, you past through your early to mid 20s, you experienced an important phase of reaching skeletal maturity for most of your skull and facial bones. As you pass through this natural process, the bone loses small amounts of volume as the periosteum (bone covering) thins and becomes less metabolically active.

You are not sagging yet, but bouncing while you run can cause more sagging, wastes your energy, and is harder on your joints. Learn to run without bouncing. Learn chi running.