Pound the steak gently to even thickness
Marinate with an acidic ingredient like buttermilk, vinegar, or lemon juice
Use a meat tenderizer or score the surface lightly
Salt the steak ahead of cooking
Cook over medium heat, not high heat
Avoid overcooking
Braise or slow-cook in liquid for extra tenderness
Rest the steak after cooking
Slice against the grain
Choose a cooking method with moisture, such as smothering or stewing