Friend has just told me about this, a 'virtual 10k race' to the bottom of the sea. Well, OK, you need to do the actual running (or walking), but you get an audio commentary (by Pierre-Yves Cousteau) narrating your journey to the ocean floor: Run to the Deep
"Discover mysterious creatures, amazing seascapes, and explore alien environments as you run down to the depths of the ocean!"
Available to download during British Science Week (from 9th to 18th March), but you can sign up now (for free).
Thought it sounded like a cool idea + a welcome change from my running playlist so wanted to share!