This is a question for me and my clients! How do you replace a 45-minute run (oops, sorry, all of you shouting “specificity!” right now. What do you substitute for a 45-min run?)
Climb stairs, check. Many mamas cannot do higher impact movements due to pelvic floor issues.
Do good cardio workout videos exist?
Any form of Cardio Strength Training..you can use pretty much any implement you want, it is really just a matter of program design and creativity.
Check out Coach Dos Remedios’ Book “Cardio Strength Training”
Its a really good book and compliments his Power Training Book quite well.