Replying to Avatar streetyogi

You mean least favorite, as those are the most effective :) For me the hardest ones are static ones, just lay on your back and raise your legs. Then wait. After a while the burn gets unbearable :)
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Jimmy 2y ago

Assume you mean just a couple inches off ground?

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streetyogi 2y ago

Just flat is sufficient, depending on your core strength it will kick in after a minute or so. Try 5 minutes :) Keep your legs straight and extended, they will start to shake and bend with time though…