Stella Trim (Maximum Cardiac Frequency). Return trotting very smooth to the starting point and repeat the remaining series. Finish jogging another five minutes, to cool and return to calm. (iStock) (iStock) If you have 30 minutes In this case the most interesting training is the one we complete in about a minute. In this time you can run about 300 meters and run fast over this distance, it forces you to lengthen your