I know there was a thread about this 4 or 5 months back, but the search isn't working for me. Basically, are all miles good for you?
I am finding myself having the odd 20-30 minutes free in the morning and evening, so if I go on the trainer and cycle 5 miles at the start of the day and then again in the evening is that actually any benefit or do I need to have a proper structured training plan for those 20 minute bursts?


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