Gym Science Explained on Instagram: "If you’re after serious triceps, your cable pushdowns need this tweak. Most guys miss out on key muscle activation here. The real secret is optimizing the stretch and contraction. Drive your elbows back for a deep stretch, then lock out hard at the bottom. That full mechanical tension is what builds real size. Follow @gymscienceexplained for more #memes #funny #viral #gymscienceexplained #explore"