Don't combine them at all. Run LOng one day, and do a HIIT session another day. HIIT is just a new-fancy Acronym for Old-School training. 2 400's at a light jog. 3x40, walk back is the rest for...
Run or Jog if you like it. Running is natural, like walking. There are no "gimmick's". Step out the door and go. No need for fancy shoes, clothes, etc.. Look at a Boxer's workout. Most still put...
