Hi I'm doing my first half marathon in September. I can maybe run about a mile before having to stop and could managed 5k in around 35-40 with some walking. However, my problems lies with at the moment I can go only get out to the gym once a week for an hour or so due to having no childcare as I'm a single mum with 2 very young children. How can I build my fitness up? If I do some workouts at home such as insanity or Jillian Michaels will it make any difference? Also when I do go on the treadmill or for run if I do interval training will that help or should I just try and run at a steady pace?