Popular Links: Circuit Training · Nutrition · Healthy Snacks. Welcome to the First Trimester Pregnancy Workout Plan: designed for Week 1 – Week 12 of pregnancy. Many of the first trimester workouts look similar to workouts you may have been doing pre-pregnancy, with some modifications to decrease core pressure during ab exercises. I know that first trimester in See more. Nov 15,  · Stay active during pregnancy with this FREE Second Trimester Workout Plan for weeks 13 – 26 of pregnancy! Maintain