Having troubles with your squats or deadlifts? Do your knees collapse inwards during leg exercise? Need to do exercises with your heels on weight plates to get better range of motion? Good bet that you're suffering from a lack of ankle dorsiflexion, which is the ability of your foot and shin to move closer together.
Lack of mobility in the ankle can cause problems and functional compensations that radiate up throughout your entire kinetic system not just affecting your knee and hip alignment. Concurrently the hip itself can also affect ankle mobility.