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A 4.3 40-yard dash averages about 19 mph (8.5 m/s), with top speed often crossing 20 mph once you’re upright.

A 72-hour fast is usually water-only; prep with lighter meals, drink fluids, keep activity easy, then break the fast with small meals.

Drink water on a schedule, add electrolytes when needed, and use high-water foods in your eating window to stay hydrated during a fast.

What breaks a fast depends on your goal, yet most fasts end when you take calories, sweeteners, or amino acids that kick off digestion.

Yes, keto coffee breaks a fast for clean fasting since butter or MCT oil adds calories and starts digestion.

Intermittent fasting diets work by setting eating windows so your body uses stored fuel between meals while you still hit daily nutrition needs.

Most road cyclists cruise 14–18 mph (23–29 km/h) on flat roads; wind, hills, fitness, and bike setup shift the speed.

A 4.6-second 40-yard dash equals about 17.8 mph on average; your top speed is higher.

At 21 km/h, your speed is about 13.0 mph, which matches a fast running pace close to elite distance race effort.

At 20 km/h, you are moving at about 12.4 mph, a steady speed between brisk cycling and slow city driving.