This exercise can be performed prior to pregnancy, during pregnancy, and in the immediate postpartum period.
Diaphragmatic breathing is another great exercise to teach you how to activate your core muscles as you take deep breaths.
The posterior pelvic tilt is another great exercise to activate your pelvic floor and core muscles while realigning your pelvic bone.
To strengthen the core and pelvic floor even more, you can do the glute bridge which can strengthen your hamstring and glute muscles.
Walking is one of the best, underrated exercises and one I strongly recommend prior to conception, during pregnancy, and immediately postpartum.
The squat is the best exercise for toning all of the leg muscles including: quadriceps, adductors, and glutes.