Constantly burning out on my rides. I live near Derbyshire / Buxton in the UK. Great for cycling and working towards an endurance race in September. My first time cycling and an ex squash player thought I could keep the duration going but oh no. Different set of muscles and nutrition management. Not sure if anyone has used this app - seems to be OK. Although if you remember I'm sure you can take on fuel when you feel like it. Neat app though. called 'endur8'...Bikeradar did a piece on them. won't let me post the link :/