Trying The “Viral” Single Arm CTI Challenge One of the hardest static holds in calisthenics is the “CTI” (Close To Impossible). Taking this challenge to a new level by increasing the level of difficulty this time by making this movement with a single arm (assisted). @ruleoneproteins always here by my side whenever I need to step up for a new challenge S/O to @slidismode for the idea 💡 #r1athlete #calisthenics #workoutchallenge | prove_it