The path up Teide.

The walk-up trail called Montaña Blanca is the most used way to climb Teide. This classic route has a distance of 8.8 kilometers and an accumulated slope of more than 1,390 meters, so the trail has a high degree of difficulty and is only recommended to those people with a good physical condition.
It was a 5 hour climb.
Copied from an old slide.