Very few exercises are truly aerobic.

1. Brisk walking
2. Running
3. Elliptical
4. Stair master and
5. Cross country skiing are all truly aerobic.
6. Swimming and bicycling are somewhat aerobic but not ideal since we do not carry the full weight of our bodies. The water and bike buffer our weight.

High Intensity Intervals (HII)  are the quickest way to get aerobically fit and are great for both cardiovascular and mental health. Here is how to do HII. Say walking is the aerobic exercise of your choice.

1. Warm up for 3 minutes.
2. Now go all out; walking as fast as you can for 30 secs.
3. Now walk at an easy but not slow pace for 3 minutes.
4. Again walk as fast as you can for 30 secs.
5. Repeat the above intervals until you have completed 4 “As fast as you can” intervals.
6. Cool down at an easy pace for 3 minutes.
7. The whole workout takes 17 minutes.
8. Do not walk fast for longer than 30 secs otherwise you will start pacing yourself but in those 30 secs give it all you have.
9. Go as fast as you possibly can. You should be gasping towards the end of that 30 sec period and the 4th interval should be significantly harder than the first one. If it is not, you are not pushing yourself hard enough during the fast intervals.