Welcome. You may want to try "sprints." This is when you increase your speed a bit and walk/run faster for 30-60 seconds every 5 minutes and return to your original speed. As you do this, you will get stronger and can increase your regular speed and increase the speed of your sprints. Another thing you can do to challenge yourself is increase the incline. Doing this in "sprints" also helps you build endurance.
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