The Charity event came at 24hrs notice and coincided with a weight loss requirement.(personal not medical)
There are a set of Three ,3000 ft +- mountains here, one in each country. (Snowden, Scarfell Pike, Ben Nevis.)
The object of the exercise is to climb all three in 24 hours. Which we did...WooHoo!!!!!
I lost a Stone (14lb) and a quarter (3.5 lb) in that 24 hour period. A Charity event and a Diet all in one hit. And it has stayed off!
Okay not medically recommended ,but boy did it feel good!

In Scotland, the traditional measure of weight is a "stone," which equals 14 pounds. Block weights weighing two stones (28 lbs.) and four stones (56 lbs.) were used to balance scales for measuring grain. These weights were thrown by locals gathering around the grain store to determine who was the strongest man in the village. The contestant must keep at least one foot within the sidelines of the 4'6" wide and 9' deep throwing box at all times. The backline and frontline - marked by the toe board called a "trig" - cannot be crossed at any time during the throw.
I have it on some authority that ceasing to bash one's self in the skull with a hammer also feels very good.
These three ~3,000ft mountains; what is the base elevation? Beginning at sea level is considerably different than beginning at 8,000ft elevation.