"8x30-30" means "30 seconds fast, 30 seconds slow, eight times in a row."

After a thorough warm-up, run for 30 seconds at about 90-95% intensity, then do a 30-second recovery jog. Make sure that you don't slow down during the workout, so you are running your last 30 seconds about as fast or even a little faster than your first 30 seconds. Run on a soft surface if you can, rather than on concrete or asphalt. When you are done, jog or walk slowly for a while to cool-down. Both the number of repeats, and the duration of the fast and slow intervals, will change from week to week.

After a warm up for about 5 - 10 minutes, maintain a pace about 10 to 15 seconds per mile slower than 10-K race pace. The last 5 to 10 minutes should be a cool down period. Another way to gauge the pace of tempo runs: a pace about midway between short-interval training speed and your easy running pace.

A slow run done at a conversational pace.