Muscles don’t give a shit if the resistance comes from a barbell, a tree, machine, doorway or our own bodyweight. It responds at best using strategically applied tension. If we’re talking that raw power, pure tension hits its peak through Isometric Training.
In a long stretch of time, many have been taught that only through movement is where strength is where its at. Research and data has proven that it’s not the only way to get strong. Movement is a tool for sure and should be prioritized but Isometric Training is a tool as well and has kick ass benefits that helps overcome plateaus.
One of the earliest known research was back in the 1950’s where it showed a 5% increase in strength by doing 6 second Isometric Contraction Exercises per day at 66% effort. In 2019, a systematic review that looked at 26 studies showed that 6-12 weeks of Isometric Training increased dynamic strength by 19-23% and a rate of force development by 24-31% in athletes.
Also in 2019, a review in the International Journal of Sports Medicine also concluded that Isometric Exercise caused less fatigue than movement training; building great joint-angle specific strength. This transferred over to endeavors such as jumping, running and lifting.
The two well known aspects of Isometrics can be seen below and the importance to why both work well together and not just individually:
Overcoming Isometrics…..
Yielding Isometrics……
In simple terms, you’re fighting against gravity in specific holds where you go for a period of time without collapsing. Think of the Plank, Horse Stance, Bar Hang or the Wall Sit. This carries over to eccentric strength. An essential point of joint health and stabilization.
One of the best methods or timing of a contraction is to take a hold, doesn’t matter if it’s a curl or wall push, you contract the muscles (flex) at a high rate (65-75% max effort for example) and stay within that intensity for 7-12 seconds. Breathe as you do this. Never, under any circumstances, hold your breath. Brace with intent and focus into the muscles. Relax, change the angle and repeat.
In the case of Overcoming Isometrics; this is one of the purest and safest forms of strength training. There’s no jerking, no failed reps or grinding the joints. Be able to do it anywhere and is incredible for both rehab and prehab. Creating tension is a simple skill but it’s not easy to generate. It takes concentration and mindfulness while squeezing as if your life depends on it. Look up men like Alexander Zass and Bob Hoffman.
In terms of the Yielding Isometrics; it teaches how to control while under load. If you’re not used to a wall sit, it can be humbling once you start to feel those quads after a bit. In the form of the amount of contraction, if you’re going for a longer period of time, lower the intensity level but keep yourself stabilized. Less tension doesn’t mean it won’t build strength, it builds that lasting strength.
Isometrics however aren’t a replacement for your regular training. It’s part of the journey that helps align your goals and longevity. Use them as finishers, a warm up before your dynamic exercises or on off days. Use force and not mindless movement to get the most out of your workouts.
One of my favorite books on the subject of Isos is through author Matt Schifferele’s Grind Style Series in which one course is dedicated to Overcoming Isometrics with greater scientific data points than I can explain here. It also has an entire chapter on how to bring Overcoming & Yielding together to form a hybrid that will have you building strength that is off the chains. This is worth far more than it should be and I believe one should have knowledge of the hybrid training.
Be amazingly awesome and may your strength gains be successful in your journey.
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