You could consider any one of these programs to up your fitness and strength to train for your marathon. We also have a new program launching on Monday from Pace and Go that you may like to include in your training.
https://grokker.com/fitness/interval-training-hiit/program/turn-it-up/606df5c4aa3a002f8436509c

https://grokker.com/fitness/interval-training-hiit/program/no-excuse-hiit-jumpstart/5fa184cfd56d0646b9c27264
https://grokker.com/fitness/cardio/program/21-day-cardio-sculpt/60076a16afd3de1478522592
https://grokker.com/fitness/toning-and-sculpting/program/lose-fat-and-sculpt-yourself/5501d0753988e3942624e41b

I have also included some cooking videos focused on Nutrition 101 that you may be interested in or you can check out all of our cooking programs at the second link.
https://grokker.com/cooking/videos
https://grokker.com/cooking/programs