Increase Your Running Stamina with Interval Training
Use interval training. There are several benefits to interval training that will help you get the most out of your runs, and increase your stamina
Perform steady intervals. This is the easiest way to incorporate interval training. You simply alternate equal periods of high and low-intensity running.
Use pyramid interval training. Pyramid intervals start with short bursts of high intensity and then build up so that the longest period of high-intensity training is in the middle of your workout. Then, you gradually pull back to the shorter burst of intensity before completing your cool down. This is somewhat more complex than steady intervals, and you may want to use a stopwatch to maintain your times.
Do variable intervals. If you play sports like tennis in addition to running, you know that speed and stamina requirements vary according to the conditions of the game. Variable intervals help you to mix up short and long high-intensity intervals in an unpredictable pattern, which more closely mimics the irregular bursts of speed that are part of typical playing conditions.