I was interested to see this ski trainer at the gym. I knew that ergs are a unit for energy but I hadn't realised what a tiny amount it is. An erg is 10^-7 Joules - and I have always thought that Joules were a disproportionately small amount. I had an idea ergs were American but they were proposed by a European and fit into a metric system. I need to do more work on the C.G.S. system of units.
