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I am looking to run my first ultra (100k) and really keen to find out from the running community what changes I need to make to my training to aid the progression from marathon to ultra. I am a 4hr marathon runner with three Marathons under my belt and run about 40/45 miles a week in the lead up to a marathon include one hill session, one temp run, one long run and 3 recovery runs. Is there any specific changes I will need to make in the build-up to an ultra? Also for a newbie to ultra's is it realistic to run one ultra in the spring and a second in the autumn?