I don't really know if I am doing a good job with my exercising. I recently bought a thread mill and I have been using it for 1 hour and some days 1,5 hour. A few days ago someone told me that you have to rest a day when you run. So run a day and then rest a day. Is that true? And I also wondered if it is better to work out 2 hours but at a lower speed or a half an hour but at a higher speed? Thanks in advance for anyone who answers.