this is my first post here, so far I have completed all the runs up to W6R2 and the first five weeks went really well. The beginning felt like a challenge, my fitness level has dropped radically since last year and long bedrest after abdominal surgery. But until this week I actually enjoyed the running and loved the feeling when each week I managed to run more and more. Even the dreaded W5R3, running for 20 minutes, didn't feel so bad, of course it was challenging but I started out slow and made it through the podcast without feeling exhausted. BUT this last week, I might have hit a plateau, or a phase where my fitness level is not enough to complete the podcasts... When I started the W6R2 it felt like my legs were made of lead, I was barely moving forward and pushed through the podcast with lots and lots of willpower as I wasn't enjoying the running anymore and felt really tired. Like my muscles are already sore when I start the warmup walk. I am dreading this week's last run, the 25 minutes. Any ideas how I can boost my energy to make this run easier? Such as what to eat before the run and when, or how to stretch before the run to make it easier on my muscles?
Just some additional info, I suffer from some stomach issues due to my illness (endometriosis) and have to be very careful with what I eat, ever since I started running I have managed to increase my calorie intake from 1200 or less to around 1400 calories a day, but is it still too little on the days I go for a run? I'm definitely not overweight (56kg/172cm) so I don't need to keep my energy intake low, it's just as much as I can manage without getting tummy trouble.