Hunters by far have the strongest ankles. Titans and Warlocks slow down during their jump when they are falling at terminal velocity in destiny. Hunters? Not so much. Hunters' ankles are so strong that they instantly (about .001s assumed for calculation) redirect the entire force behind their fall into upward momentum. If we assume terminal velocity is 53 m/s (it is only on earth, but I don't feel like doing the calculation more than once) and a duration of 0.001 seconds to complete the jump animation, hunters accelerate at a ridiculous 53000 m/s^2! Alone, that number may not look like much. But let's turn that into a force. Let's say the average male Hunter weighs 65kg. His gear could be anywhere from 20-40kg, so let's make it easy and round the whole thing to 100kg for Hunter+full load out of armor and weapons.(It could be much higher than this, if you were using a rocket launcher with full ammo, a NLB, and a sniper rifle, as this would be the heaviest load out possible.) if force is equal to mass times acceleration, on a single jump out of terminal velocity a hunter generates 5.3million newtons of force! It only takes 2000-4000 to break a human ankle. For the sake of brevity I will stop here, but this force is purely stopping their downward momentum. Redirecting it and actually going up would require an absolute metric shit ton more. You would have to account for the speed at which a hunter would need to hit the particles in the air for them to act as a solid to jump off of, and also account for the speed with which a hunter is jumping to get the final amount of force exerted on a hunter's ankles. Conclusion: Hunters have the strongest ankles by far, and although you don't want to mess with a Titan's knees, a Hunter's ankles would actually rend your skin, muscle, and fat from your bones while powdering said bones in the process.