G’Day Sheryl,
You’re getting lots of good advice here. I’m just starting on the same sort of regimen, though I’m also in the gym five days a week.
Anyway, I found my inspiration in the earliest Church, through the Didache. You can find it at:
earlychristianwritings.com/didache.html
(I recommend the Roberts-Donaldson translation, but the Kirsopp-Lake is also good.)
Chapter 8 includes some fascinating practical instructions on fasting and prayer. It has already helped me a great deal and, over time, has helped me become stronger in my faith and (hopefully) a better Christian. I hope that it may do the same for you!
Good luck with your quest! Peace be with you.