Anton Webern, 6 Stücke für Orchester op. 6
Difficult and muscular stuff. Webern loved the Alps, and his music often seems to reflect the small and strange thoughts you might have on a long and lonely climb.
For me, when I am sweating, and worrying, sometimes I look down, and the sight of small alpine plants, the tiny flowers, or the crystals in the rocks, then Webern's intense music comes into my mind.