Is it safe? It should be obvious that getting kicked or punched can put the baby in harm's way so kickboxing should be no-contact from the get-go.
Altering your routine: Stick with air kicks and punches and lower the height of your movements to avoid bumping your belly or losing balance. High impact moves like jumping rope will probably be uncomfortable if not impossible after the first trimester. All that said, if you're careful, you should be able to kickbox the entire nine months.
Is it safe? You bet! In fact, lifting weights will help your joints deal with the weight gain, alleviate lower back pain and give you extra strength to get you through your day.
Altering your routine: Once you enter the second trimester, sit, kneel or use support during any exercises that throw your balance off, and practice good breathing techniques even more diligently than usual. Your doctor may recommend lightening up the weights and upping reps to diminish injuries and blood pressure issues. She may also recommend specialty exercises for your pelvic floor and abdominal muscles to help prepare for labor and delivery.
Recommended Pregnancy Workout DVDs
Used to at-home workouts? No prenatal exercise classes in your area? Stay on track with one of these, each of which features routines specifically tailored to expectant mothers.
-- Yoga for Your Pregnancy
-- Crunch: Yoga Mama
-- Fusion Pilates for Pregnancy
-- Quick Fix Prenatal Workout