How to train to run a 5k in 21:39 or run a Half Marathon in 2:01

A little background of my running career to prove that I have some knowledge when it comes to running. I’ve been running consistently since the sixth grade running over 46 races all the way till the end of high school. I ran for one year at the collegiate level at a D2 college in Southern Arkansas
For training for a 5k it is diffrent because for a 5k its more of an all out race in my opnion becuase its only 3 miles.
For 5K training, it’s best to start with a run–walk approach, often called fartlek training. This means alternating between running and walking (or jogging), which helps build endurance without overwhelming your body. For example, you might begin with intervals like 30 seconds of running followed by 30 seconds of walking or light jogging. As your fitness improves, you’ll gradually be able to run longer distances continuously—eventually working up to at least a mile without stopping.
From there, you can take one of two approaches: either focus on building your overall mileage first, or work on speed over shorter distances. Many runners find it helpful to develop some speed early on with short, quicker efforts, then gradually increase distance once they feel comfortable maintaining a faster pace.
As you move into a more structured 5K training routine, your week should include a mix of workouts. Typically, you’ll have one moderate run of about 3–4 miles at a steady, comfortable pace (not too hard, not too easy). As you progress, this can increase to around 5–6 miles at a similar pace. You should also include a day for speed or hill workouts to build strength and improve pace, a longer run to develop endurance, and a few rest or recovery days to allow your body to adapt and avoid injury.

For half marathon training, it’s best to start with a run–walk approach, often called fartlek training, especially if you’re building your base. This involves alternating between running and walking or light jogging to gradually build endurance without overtraining. For example, you might begin with intervals like 30 seconds of running followed by 30 seconds of walking. As your fitness improves, you’ll be able to run longer stretches continuously eventually working up to several miles without stopping.
Once you’re comfortable running a few miles at a time, you can shift your focus. You might start by building overall mileage to create a strong endurance base, or incorporate some speed work on shorter runs to improve pace and efficiency. Many runners benefit from doing a mix of both—developing speed on shorter distances while gradually increasing total mileage.
When following a structured half marathon training plan, your week should include a variety of runs. You’ll typically have one or two mid-distance runs (around 3–6 miles) at a moderate, steady pace not too hard, not too easy. You may also include a tempo run or speed workout, such as intervals or hill work, to build strength and improve your pace. The most important run of the week is your long run, which gradually increases in distance each week to build endurance for race day. In addition, you should include a couple of rest or recovery days to allow your body to recover and prevent injury.
Some tips and tricks according to ME
- eat a good diet to help fuel for practices and races- theres a happy medium becuase you don’t wanna eat to much to barf while on the run, yet you wanna eat enough to be able to run and not pass out
- HYDRATE- hydration is everything don’t just jug a bunch before you run but continually staying hydrated
- you can do warm ups and cool down runs which is usually around (1-3 miles) which helps with the blood flow/heart rate elvation before the race and after it help with lactid acid in the calves