Awarded top 10 Best Prenatal Workouts by Fitness Magazine. Leah Sarago, CSCS and Pre/Post Natal Exercise Specialist, has designed this comprehensive training program to help you safely exercise during all three trimesters with 15 minute segments and a training plan for beginners to advanced. Equipment Needed: Yoga mat, sturdy couch/chair back, 3 sets of weights (light, medium, and heavy).