I'm Morris Brossette, and this is how to increase spring endurance for the 300 meters. I'm gonna give you one exercise that you can use to increase your sprint endurance for the 300 meters, and it is a super slow spring squat. Okay, so the goal of this super slow split squat is ultimately to be in a constant state of contraction for up to five minutes. We're gonna start out a little bit slower than that and start you out with 90 seconds. So what we're going to do is get into a split squat stance, alright? The weight is going to be on my heel of my front foot and the ball of my back foot. What I want to do is take it in four second increments. I'm gonna drop down slow for four seconds, I'll hold at the bottom for four seconds while keeping the weight on my heel and keeping my glute engaged on the front leg, and then I drive up for four seconds, again nice and slow, keeping this leg in constant contraction. Before I get to the top and lock my knee out, I return back down into the movement and then back up for four seconds. So, I'm going to increase the duration of the isometric hold by increasing my number of repetitions. So I'll go from six reps to eight reps, and then from eight reps to ten reps, and by the time I get to that 10th rep range, that's gonna keep me in a constant contraction for about four and half to five minutes.