There are different types of HIIT but an easy one to begin with is to simply warm up for 3 minutes on an elliptical machine or by walking. Then work out for 30 seconds so that at the end of the exercise you feel satisfied. Reduce the speed to slow down to a moderate pace. Do this 7 more times or for total 8 intervals. Start with one interval and as your body is ready to take more increase the intervals. Studies show that HIIT to be the absolute premier cardio for weight loss and optimal health as compared to longer, traditional cardio.
2. Ab Plank is a great exercise to really challenge your entire core and build up your strength and endurance. The Plank works the lower abdomens, the oblique muscles and your lower back. It takes focus and concentration plus some upper body strength. Start with holding the plank position for 30- 40 seconds and build your way up. You will be amazed at how strong your cores will get by doing this exercise regularly.