Reverse transcriptase is the viral enzyme responsible for making a DNA copy of the RNA genome from a retrovirus. As such, it is technically known as an RNA-dependent DNA polymerase. This is opposite to the usual flow of genetic information from DNA to RNA to protein.
This means downhill sections of the ride may be faster, and uphill sections slower. 1  Easy: Under 10 mph. 2  Leisurely: 10-12 mph. 3  Steady: 12-14 mph.  Moderate: 14-16 1  mph. Brisk: 16-18 2  mph. Vigorous: 18- 20 3  mph. Strenuous: 20-22  mph. Super Strenuous: 22+ mph.
You'll be even happier if you make tempo running a part of your weekly training regimen, and get results that make you feel like a Kenyan--if not quite as fast. UP TEMPO. A classic tempo or lactate-threshold run is a sustained, comfortably hard effort for two to four miles.The workouts below are geared toward experience levels and race goals. GOAL: Get Started Coach Gale Bernhardt uses this four-week progression for tempo-newbies. Do a 10- to 15-minute warmup and cooldown.OAL: 5-K to 10-K Run three easy miles, followed by two repeats of two miles at 10-K pace or one mile at 5-K pace. Recover with one mile easy between repeats. Do a two-mile easy cooldown for a total of eight or 10 miles. GOAL: Half to Full Marathon Do this challenging long run once or twice during your training.