Shia LaBeouf certainly looks rehabilitated!

The eccentric actor gave himself a workout in the middle of an Amsterdam-area sports field, doing high kicks, waist rotations and even Downward Dog!

On top of his amazing moves, Shia wore an amazing outfit ... his favorite purple Spandex jogging pants, a turquoise hoodie, and brand new hot pink and turquoise Nikes. He looks like a teenage girl!

The actor's not faking it, though -- he recently ran 144 laps around an A'dam museum. His "marathon" around the Stedelijk was a conceptual art performance, according to the actor. Meanwhile, a 12-hour conference was taking place inside the museum -- the performance art was supposed to mirror the "marathon" debate going on inside, according to the museum's curator. Hmmm ...