Back to running ... most people in serious or semi-serious training for races of 10K or above will run 5 days a week. Marathoners will gear up for a race by running over 100 K per week. It is not inherently "dangerous".
However, when you first start running, running on alternate days while gradually building up your mileage is the correct way to go.
If you are trying to lose weight via running, you want to keep your heart rate in and around the 60-65% of max range. This will optimize your weight loss more than running harder will.
There are a lot of formulas for determining heart rates but if you can carry on a complex conversation or sing a song while you run, you are probably in a good heart rate range for fat loss.
Good luck!
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