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*Any* increase in intensity or routine change-up holds the risk of injury. Not to mention, running for 30-40 minutes no matter how low the intensity places a strain on the muscles and joints of the body. And you're suggesting that a new runner does that *twice a day*?
Long, low-intensity jogs don't make for a faster runner. They make you better at exactly what you're doing: working at a low-intensity for long periods of time. Nothing inherently wrong with that, but not exactly useful for someone training for this type of job.
Interval training is supposed to be intense - and it's important that each individual works within their current fitness level. i.e. a new runner can alternate between a regular walk and a power walk on a treadmill, which will feel intense for him/her. A more seasoned runner can alternate between jogging and sprinting between telephone poles - that can feel just as intense, but there is a difference in fitness levels here. It's when someone pushes themselves too far that they risk injuring themselves.
Long, low-intensity jogs don't make for a faster runner. They make you better at exactly what you're doing: working at a low-intensity for long periods of time. Nothing inherently wrong with that, but not exactly useful for someone training for this type of job.
Interval training is supposed to be intense - and it's important that each individual works within their current fitness level. i.e. a new runner can alternate between a regular walk and a power walk on a treadmill, which will feel intense for him/her. A more seasoned runner can alternate between jogging and sprinting between telephone poles - that can feel just as intense, but there is a difference in fitness levels here. It's when someone pushes themselves too far that they risk injuring themselves.