When most think of cardio; it's running or jogging on a treadmill or going around a town or neighborhood or even doing some kind of aerobics like spin classes. Those have their pros and cons like anything else but the real form of cardio comes in so many other things we tend to forget. You can chop wood or swing a sledgehammer smashing a tire, do sprints, work with the slam ball, do hundreds of squats or step ups, hell even do plyometrics. All of these give off a powerful cardio affect that actually is a lot more functional than just pure jogging. However; does Isometrics count as cardio?
The legendary Steve Maxwell has said that some of the best cardio is from strength training and he was referring to more on the Isometrics side of it and for years, I didn't think much of it cause I didn't even think it was possible. Cardio in a nutshell is just exercising to get the heartrate up to a certain level and keeping it there for a good period of time or raise it and lower it in intervals like from Sprints for example. When I started to really understand how easy it was to get the heartrate up during Isometric Workouts, it became clear that Isometrics are one of the best methods for getting in a great cardio session. If you really think about it, you can get some killer cardio from Yoga especially DDP Yoga.
When it comes to Isometrics, you learn to provide how much tension is used within the amount of time you're working a hold. If you don't use a lot of tension say 30% of your strength, you can do a hold for a good amount of time like say trying to do a 5 minute Horse Stance; it doesn't sound like that long but when you keep the tension at a certain point and the muscles start to burn and controlling your breathing, at a certain point, it becomes harder and harder to keep a steady breathing pattern. Your heartrate goes up and starting to sweat and you're not even moving. How crazy is that? Now how about using tension where you only last 7-12 seconds? The amount of tension normally would be around 65-80% of your strength so you're really digging into the hold hard and your breathing pattern is different. It's not the same as if you're using lighter or decreased tension.
Both short and long duration holds benefit the body well and your breathing is a key in both. Never hold your breath whatsoever in Isometric Training or in most training methods for that matter. Last night I did an Isometric Workout where I did both Overcoming & Hybrid Isometric Exercises for 45 seconds each doing a curl, squat, deadlift, plank, bent arm pushup and dead-bug. Those kicked my ass because after each exercise, I was feeling my heartrate go up and I was pushing/pulling/squatting more in the 60-65% strength range and it felt like an eternity, they were that tough. I was sweating, breathing hard and feeling the pump in some of them. I wasn't even moving yet I came out of that feeling like I just ran a marathon.
Never underestimate the power of Isometrics. They'll kick your ass in ways you didn't think were possible and can build muscle like crazy (not over-bloated type muscle like in today's bodybuilding) and I mean the type of muscle that hardens and is tight. It teaches how to handle tension and controlling it. Strength & Power beyond belief man and with the cardio aspects of it, that's just icing on top of a killer cake. Now that doesn't mean Isometrics are the end-all-be-all, movement is life after all so do plenty of training that's dynamic to get the best of both worlds. Be strong but be safe as well, training is meant to help prevent injuries, not cause them and Isometrics when done right is one of the safest yet most powerful methods to help build an injury-proof body.
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