Hello. ..I have recently been diagnosed with a calf strain/ moderate tear. Just had my first physio appointment. My dilemma is I have a place in the London marathon and just under 10 wks to go. The physio is optimistic that I can still run. But cannot start running for another 3-5 weeks. I have exercises to do etc. Just had my first session in the gym using the bike and a cross trainer. Has anyone got any ideas about how much I should be doing which is matches my marathon plan?