I'm a first time marathon runner who was hoping to achieve a sub 4 hour time. Unfortunately I got acute tendonitis on both my achilles 3 weeks ago after I completed the 18miler. I've been resting ever since and was able to complete a short (30min) run pain free yesterday.
I am now hoping to run the 20miler this weekend before the London marathon on the 24th. I'm really keen to get this distance done before the marathon but I reading a lot of stuff which says that the long runs should be done 3 weeks before.
Is it ok to do the 20miler 2 weeks before?
Many thanks for any advice!