So unquestionably you have knowledgeable your legs with bodyweight in basic terms , your pressing stream ( push ups ) and your in basic terms pulling stream is pull up , and you're thinking why your decrease back is vulnerable .... properly answer is easy : upload on your ordinary some posterior chain workouts ( ineffective carry and its editions ) barbell pulls etc , and you will see a progression very immediately . playstation : you acquire stable numbers with pull united statesand that's very stable pulling stream . No your lunges weren't for no longer something , they're going to teach you how to on your quest for potential further down the line . be certain to shop doing them , perchance upload weight in time , once you're waiting . For heavy ineffective carry you'll want stable legs too . Posterior chain ( decrease back muscle mass ) are made for heavy lifting , with ideal spinal alignment .