Email this page to friends Thinking about Serving? Get the information you need to decide if a military career is right for you. No obligation -- just free information from the branches of service that interest you. Joining the Military 10 Steps to Joining the Military Contact a Recruiter Now Ace the ASVAB About the Author Stew Smith is a graduate of the U.S. Naval Academy, a former Navy SEAL, and author of several fitness and self defense books such as The Complete Guide to Navy SEAL Fitness, and Maximum Fitness. As a military fitness trainer, Stew has trained hundreds of students for Navy SEAL, Special Forces, Air Force PJ, Ranger Training, and other physical law enforcement professions. His eBooks at Military.com can help you achieve your fitness goals, whether you're a beginner or an expert. For more info on his books, visit the Military.com eBook Fitness Store. View the Smith Archives Email Stew Smith at stew@stewsmith.com. Visit Stew Smith's Official Website: www.stewsmith.com. Get $985 a Month! Your service may have earned you great education benefits. Get up to $985 per month to pay for your undergraduate, graduate or technical degree. Find out about military-friendly schools today.

Is it hazy, hot and humid in your area this summer? During the hottest months of the year, it is difficult to find the time to run or walk outside unless you exercise as the sun rises or sets. Even then, the humidity still soaks you like you were in a sauna and in most urban areas the air quality can be actually harmful to your lungs. Here is my answer to this week's cardio fitness question:

It is so hot here in Texas - when I try to run outside it about kills me. Do you have other options besides the standard run on a treadmill in the AC?

You took away my number one answer but not MY number one choice for getting cardiovascular exercise during the dog-days of summer. Summer time is a great time for water - not only to drink it but to get in it and swim. Here are several workouts that I love to do to stay cool and workout during the day either in an indoor/outdoor pool or beach:

My number one favorite cardio exercise that I do year round is the Hypoxic Swim Pyramid. Hypoxic means "low oxygen." The goal of this workout is you decrease your breaths per stroke as you increase the distance causing the heart to race into the anaerobic zone. This gives you a great cardio workout that will drop your resting heart rate close to that of Lance Armstrong (32 beats per minute!). Now that is in shape! Here is how the Hypoxic Pyramid works:

Warm up: Swim 50-100m freestyle breathing every 2 strokes. A stroke is each arm pull, so two strokes is a left and a right arm pull and you take a breath after every 2 strokes. Stretch your arms and legs for a few seconds and begin the workout.

Swim 50-100m freestyle breathing every 4 strokes and build up to 10-12 strokes per breath for 50-100m each and work your way back down the pyramid. This workout, if you go from 2 - 12 - 2 using the even numbers as your step will only take about 20-30 minutes but will challenge your lungs to the maximum. It is not recommended to try this workout alone or without a life guard for obvious reasons, though I have never heard of anyone holding their breath while surface swimming and passing out. One workout I would never recommend to try is underwater swimming due to "Shallow Water Blackout." Many great swimmers have drowned due to "pushing the envelope" of how far they can swim underwater. Stay safe! Never swim alone!

Another great swim and PT mix is what I call the Swim/PT Workout:

Swim any stroke you wish for 100m, get out of the pool and do 10-20 pushups and 20 abs of choice. Get back in the water and repeat above ten times. This totals 1000m of swimming 100-200 pushups and 200 abs of choice. This is one great workout for the arms and lungs. For more fun, make the swim a hypoxic pyramid adding the PT at every 100m. WHEW!!!

The final favorite water sport I love to do if at the beach is the RUN - SWIM - RUN: Usually at the beach you have a nice breeze, cooler air, and of course, cool water. Mix it all in and create your own mini-adventure race of sorts:

Run down the beach about ½ mile -- stop -- and turn towards the water and start swimming just past the breakers which is usually about 100m, then turn back to where you entered the water and swim back to shore. Once you have reached the shore, continue the run for another ½ mile and repeat the swim. You can do this as many times as you can making a great 30-40 minute workout that will smoke you if trying to run and swim fast for these short distances. In the SEAL Teams we did these and called the workout a RUN-SWIM-RUN-SWIM-RUN-SWIM-RUN and made it a race around buoys in the water and mile markers on the beach.

I hope that helps you with some ideas of how to stay cool and really keep working out hard this summer. Looks like August is going to be another hot month so enjoy the water.

These workouts are used in the eBooks sold on the Military.com eBook Fitness Store especially in the Special Forces workouts that require swim tests like the Air Force PJs, Navy SEALs, and the RECON Marines.

If you have any questions or comments, please send them to stew@stewsmith.com. I love to hear from you and answer all my emails.

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© 2004 Stew Smith. All opinions expressed in this article are the author's and do not necessarily reflect those of Military.com.