Laura, how old are you. My attitude is just go for it. I started running 2 years ago and my first run was 30 minutes, full pelt, none of this walking malarky. The only advice i would give you is get a heart rate monitor. That way you can see if you are overdoing it, and you can also measure improvements. Not only by time, but by heart rate.
Try this fitness test based on heart rate recovery. If you do well its a good motivator to carry on. Basically you exercise to a given heart rate target, then see how quickly it drops over 2 mins. The lower it drops, the fitter you are.
Hi, nice to see everyone still active. I'm still running, but not very disciplined. A couple of times a week on average. 5K and 10k's. Regarding injuries, no problem apart from every now and then i can feel my knees a bit. Does anyone do any exercises to strengthen the legs/ joints, ie injury prevention.
Claire, i'd say the trainer is worthwhile as long as you reach a decent heart-rate. Get a heart rate monitor (£30 off Amazon). I run once a week and easily reach 144-155 bpm. however on my exercise bike its hard work to reach 140 bpm because the bike is taking most of the weight and its only my legs doing any work.