This video will explain how the deep core muscles function together to move you and stabilize you and what's happening every time you take a breath.
Continuing the link of the breath to the pelvic floor to help you "feel" that pelvic floor engagement.
Once you’ve made connection of the transverse abdominis and pelvic floor to your breath you can practice adding movement. Work to keep the pelvis stable as you move into these half marches.