Watch this instructional video on Front Lever Progression and determine where you are in the progression.
The main foundation of Front Lever is pull-ups. Essentially, you want to get very comfortable on the pull-up bar and become proficient in pull-ups and all variations of pull-ups.
If you are a beginner, start from hanging on the bar (deadman hang and one-arm hang) and perform scapular manipulation (protraction and retraction—similar concept to lengthened partials in weightlifting). This can help build incredible grip strength and neuromuscular connection (mind-to-muscle connection). Grip strength and scapular manipulation are essential to all calisthenic movements to develop control and execute proper technique. In fact, scapular manipulation in weightlifting/bodybuilding is often overlooked, but it is a critical factor to executing proper techniques in bodybuilding exercises—the same principle applies to calisthenics.
Utilize additional resources to aid in your front lever progression if required.
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How to Front Lever - Step by Step: