I am already heavy but i don't wanna gain to much during my pregnancy what type of exercise should i do while i aam pregnant?

Great question!: By far the best exercise you can do is walking! make sure you have a comfortable pair of shoes! and take nice slow walks...Great for the circulation; and low impact. You might also try using an elliptical machine; as this is also low impact on your joints, just do it slowly and you'll get a great work-out. Yoga is another great thing to study while pregnant; very relaxing. Best of luck!

Intervals Best: Cardio exercise is basis for calorie burning. But the secret on achieving your goal or breakthrough a plateau is high intensity interval training (hiit) that accelerates fat burning in less time, because it raises your metabolic rate for hours afterwards! here's a link to program i offer patients (get doctor ok first): http://womenshealthfremont.Com/webdocuments/hiit-workout.Pdf.