What's a high gear?

Here's an easy way to remember it.  a low gear will be in the small ring, where your pedaling fast and going slow,  like how 4-wheel low in a Jeep is for rock crawling.  a high gear would obviously be the opposite, using the big ring.

Great, thanks.

I re-read the description of the workout and it still did not make it clear.

But now I know, and knowing is half the battle.

Low gear would be the bigger rings in the back, and the smaller rings up front. Bigger gears are the smaller ones in the back, and the bigger one up front.

so, your lowest gear would be small (up front), and big (in back).

The way you often see gearing expressed is something like 54x16, where the bigger number is the front chainring, and the smaller number is what ring you are in on your cassette (The rear gears attached to the wheel.)

If you see a crankset referred to as 54/39, it's 54 teeth for the big ring and 39 teeth for the smaller ring. If you see it written as 12-23, that's the cassette in the back, the smallest ring is 12 teeth and the biggest is 23. (Just as an FYI, a 12-23 standard 10 spd cassette will have rings of 12-13-14-15-16-17-18-19-21-23).

Sheldon Brown (http://www.sheldonbrown.com/gears/) has a great calculator, that can show you what speed you will be going in different gear combinations at different RPM (With different crank lengths as well.)

John