Hello dear moms and mommies to be. I have a question, is there anything I can drink or eat that can…

Hello dear moms and mommies to be. I have a question, is there anything I can drink or eat that can give me energy to workout? After my first born it was hard to work out and I out on some weight. I started going to the gym with my husband I was very motivated and on the days I would feel tired or lazy I'd take a pre workout shake, Don't think I can take the pre workout shake now, And I have been feeling extremely tired and achey with no motivation to workout and I bet when I get on that treadmil I'm going to be out of breath in like 3 minutes lol. What can I do or eat or take to get energy?.