Not your everyday workout for sure, Rob Ginnivan must be helluva fit to this. He just ran a half marathon on a generator powered treadmill floating on a hot air balloon. He did it for charity too.

The Telegraph reports that it took Ginnivan twice as long to run the marathon than usual because he had to take tiny steps on a mini treadmill. The rising balloon put the treadmitt at sight, incline with each step the balloon rocked from side to side like a boat.

Ginnivan hopes to raise $100,000 for the Heart Foundation with a campaign of running in the air and at sea. Check out the video of him doing it below: [The Telegraph]