How Hard Are You Working?

It’s a brand new year and many of us made a resolution to exercise more. We all know that exercise has many benefits for our hearts and lungs. Did you know that it also reduces your risk of dementia later in life? The best exercise is one that you will actually do, so pick something that you enjoy. For me, that is water exercise, hands down!

The American College of Sports Medicine recommends 30-60 minutes of moderate intensity exercise five days a week, or 20-30 minutes of vigorous exercise three days a week. So it is important to know how hard you are working. That’s not so easy in the pool. Immersion in water relaxes your blood vessels so that stroke volume increases, that is, your heart pumps more blood to the working muscles with each beat than it would on land. Hydrostatic pressure compresses all body systems, including the blood vessels, which means the heart doesn’t have to work as hard to return blood from the limbs back to the heart. Therefore your heart uses fewer beats per minute while exercising in water (called your aquatic deduction) than the equivalent intensity on land. You can measure your heart rate on land and in water and use formulas to determine your target heart rate. All that is too much trouble for most people, including me. Instead, many of us wear fitness watches. These do not take your aquatic deduction into account to accurately tell you how hard you are working, but they can tell you whether your heart rate is increasing or decreasing. I use my fitness watch to give me a general idea and then combine that with a rating of perceived exertion.

The Rating of Perceived Exertion is a method of assessing effort, strain, discomfort, or fatigue experienced during exercise. Research has shown that although this method is subjective, it is fairly accurate. The Aquatic Exercise Intensity Scale was developed to take into consideration the unique aspects of training in water. it uses a scale of 1-10 to help assess intensity levels.

  1. No effort at all (lying down).
  2. Extremely little. Your heart rate is near resting.
  3. Very easy. You are comfortable but breathing a bit harder.
  4. Easy. You are working a little bit, and you could do this all day without any problems.
  5. Somewhat easy. You are working a little harder, but you can still talk easily and sing.
  6. Moderate. Your breathing has increased at a noticeable level. You can still talk, but not sing.
  7. Somewhat hard. You now have to breathe through your mouth. You can still talk, but you don’t really want to.
  8. Hard. Your heart is pounding. You can grunt in response to questions, but you can only keep this pace a short time.
  9. Very hard. Your breathing is rapid and so is your heart rate. You can’t do this much longer.
  10. Maximum effort. All you can think about is how much you would like to stop because you can’t go any further.

If you are wanting to do 30-60 minutes of moderate intensity exercise five days a week, you would work at level 6 to 7. To work at level 6, use long levers at full range of motion. To work at level 7, increase the speed of your movements without decreasing the range of motion. If you are wanting to do 20-30 minutes of vigorous exercise three days a week, you would work at level 7 to 8. To work at level 8, add acceleration and power to your movements.

If you are just starting out. It is common to go all out in your enthusiasm to begin a fitness routine. But if you have not exercised for a long time, you can easily overdo it, and suffer from muscle soreness, fatigue or even sustain an injury. It is better to focus on form (maintaining good alignment) and performing the exercises correctly at first. Work at a somewhat easy level. After you have gotten comfortable with that, then start to increase your intensity gradually. Your goal is to make your exercise routine a life long commitment.

For more information on measuring intensity, see Lori Sherlock’s video on Wavemakers. If you want to dive deeper into the subject, see page 11 in the new AEA Aquatic Fitness Professional Manual. For lesson plans that progress from Moderate to Somewhat Hard to Hard or Very Hard, see my book Water Fitness Progressions.

See you in the pool!

Author/Instructor Photo

Chris Alexander

Leave a Reply

Your email address will not be published. Required fields are marked *

New Year’s Resolution: Exercise

According to the Statista Global Consumer Survey the Top New Year’s Resolution for 2023 is to exercise more. We all know that exercise is good for us, but we also know that New Year’s Resolutions are frequently broken. Why do people so often stop exercising? According to an article in Diabetes in Control, the reasons are (1) A perceived lack of time, (2) Exercise related injuries and (3) Exercise is not fun (which is often due to starting at an exercise intensity that is too high for their fitness level). Here are some suggestions to deal with each of these problems:

(1) A perceived lack of time. People who successfully incorporate exercise into their lives often dedicate a specific time in their schedule for working out. They plan to exercise at 9:00 AM 3 times a week, or at 6:30 PM after work on Tuesdays and Thursdays. Then they don’t schedule anything else for those times. An easy way to do this is to sign up for a class that is offered at the time that is most convenient for you. People don’t often think of water exercise as an option in January, but exercising in an indoor heated pool has its advantages over going for a jog outdoors in cold weather in the dark. According to an article in Healthy Body at Home, it takes an average of 59-66 days to create a new habit, so make an effort to stick with your class for 2 months.

(2) Exercise related injuries. The hydrostatic pressure of the water slows movement down, which greatly reduces the risk of injury during water exercise. It also reduces the risk of falling. Accidents can happen anywhere though, so make sure your pool is staffed with lifeguards.

(3) Exercise is not fun. Do you remember how much fun you had playing in the water as a child? For many people, water exercise brings back that sense of fun. At the same time you can achieve intensity levels that allow you to meet your fitness goals. That means it is possible to start at an exercise intensity that is too high for your fitness level, which can be discouraging. Instead it is a good idea to start at a moderate level (you could do this for a long time), and progress to working somewhat hard (you are starting to feel it), and then hard (making an effort to keep up), before progressing to very hard with high intensity intervals.

Here are some guidelines to help you work through these progressions. In shallow water the base moves are walk, jog, kick, rocking horse, cross-country ski, and jumping jacks. Walking is good for warming up and cooling down. Jog, kick, rocking horse, cross-country ski, and jumping jacks all have multiple variations. (1) Jog. You can jog with the feet hip distance apart or wide. You can cross the midline in front with an inner thigh lift or cross the midline in back with hopscotch. You can lift the knees in front or the heels in back. (2) Kick. You can kick forward, kick across the midline, kick side to side, or kick backward. (3) Rocking horse. Rocking horse can be done front to back or side to side. (4) Cross-country ski, jumping jacks and all the base moves can be varied by using different arm movements or different foot positions. While performing these moves, your heart rate and breathing rate should increase noticeably. Your muscles will feel like they are working, but you could maintain this level for a while before having to stop. You may compare this to a brisk walk.

Increase the Range of Motion. When working at a moderate pace becomes easier, it’s time to go to the next stage. Large moves take more effort than smaller moves. Increasing the range of motion increases the intensity to somewhat hard. Get the knees high in your jog and pump the arms in big movements. Start your inner thigh lift with the feet wide apart and lift the inner thigh high. Start your hopscotch with the feet wide too. Kick higher – front, side or back. Lift your knees high in front and your heels high in back with your rocking horse. Perform cross-country ski with your full range of motion. Take your feet as wide as possible in your jumping jacks and cross the legs in the center. Focus on achieving your full, pain-free range of motion. At this level your heart rate, breathing pattern and muscles are telling you that you are working hard. You have to breathe through your mouth since nose breathing is not enough to give you the oxygen you need. You are past the point of feeling like you could do the exercise all day.

Add Speed. When increasing the range of motion becomes more comfortable, it’s time to add speed. Faster moves increase the intensity level to hard. The tendency, however, is to decrease the range of motion as speed is increased. You work much harder if you maintain the same full range of motion while speeding up. Pay attention to what you are doing to avoid slowing down. Your heart is pounding, you are breathing hard and you would rather breathe than talk. You can only say 2-3 words before you have to take a breath. This intensity is not comfortable and cannot be maintained for a long time.

Add Acceleration. Once your body gets used to working hard, it’s time to push it up to very hard by adding acceleration to your moves. There are two ways to add acceleration. (1) Accelerate off the pool floor, or jump. Take your jog to a leap and your wide jog to a frog jump. Perform your inner thigh lift and hopscotch with a rebound. Rebound with your kicks as well. Jump and tuck your feet under you with cross-country ski. With jumping jacks, jump and touch your heels together before landing with your feet wide apart. (2) Accelerate against the water’s resistance, or add more force to the move. Take your jog to a steep climb by stretching out your arms and pressing alternate hands down while at the same time lifting the knees high and then pressing the heels down toward the pool floor, as if climbing a steep mountain with trekking poles. Lift your inner thigh with power as you press the opposite hand down forcefully toward the thigh. Perform a high kick powering the leg on the downward phase or power both upward and downward. Kick side to side with arms and legs opposite, adding power to the move. Instead of rebounding as you kick side to side, you can stay grounded, and you might be surprised at how hard it is. Karate front kicks and side kicks also involve using force against the water. Kicks backward, cross-country ski and jumping jacks can all be performed with power. Try the cross-country ski low in the water so that more of your body must push against the water’s resistance. Be mindful about what you are doing because the harder you push against the water, the harder the water pushes back. Forget talking at this level. You may be able to belt out one word at a time, but you don’t want to because breathing is your goal. Your muscles are screaming for oxygen and therefore your breathing pattern and heart rate is rapid. This intensity level is reserved for shorter intervals, and you are so glad that there is a limit.

This description of aquatic exercise intensity levels comes from the Aquatic Fitness Professional Manual. Lesson plans that demonstrate how to progress through these intensity levels can be found in Water Fitness Progressions. Good luck with your New Year’s Resolution to exercise more. See you in the pool!

Author/Instructor Photo
Chris Alexander