The hex bar deadlift max and body weight of an athlete can indicate their speed and power on the treadmill. Improving the hex bar deadlift max without increasing body weight can result in an improvement in speed.
When lifting weights, it's important to recruit the larger motor units to stress the nervous system and get stronger. Heavy lifting with 70-95% of maximum effort and 2-6 reps per set is key for recruiting these units and building muscle mass.
The expert deadlift max for healthy adults is anywhere from 2.2 to 2.6 times their body weight. Elite level football players require a 3.2 times their body weight in their hex bar deadlift to run a 4-5 40-yard dash.