"Isometric contraction only increases muscular strength in the exact position you're engaging," Calabrese explains. Of course, these muscle-blasting moves do come with certain limitations. "This puts the muscle under tension for a longer period of time, which is what's needed for gains in strength," she adds. You can make these moves even harder by adding weights, too. They're good for building strength without impact or full range of motion, which is great for someone who's recovering from an injury or just wants to take it easy on their joints." "Isometric exercises are beneficial because they don't add a lot of extra impact to your joints and can be performed without any equipment. "A still exercise is also known as an isometric exercise in the fitness industry," says Autumn Calabrese, Beachbody super trainer and creator of 21 Day Fix.
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