Some Fighters spend years honing their physical skill, to a point where they move in a blur, almost flying around opponents, delivering deadly fast strikes. 

Adrenaline Rush

Starting at 3rd level, when you use your Second Wind feature, you can also take the Attack, Dash, Disengage, or Dodge actions as part of that same bonus action. This bonus action can only be used for one attack. 

Additional Proficiency

Starting at 3rd level, you gain Proficiency in the Athletics skill, if you don't already have it. If you already have proficiency in this skill, you can add twice your proficiency bonus. 

Surge of Speed

Starting at 7th level, when you use your Action Surge feature, you also gain one additional Reaction, which lasts until the start if your next turn. Also, if you take the attack action using your Action Surge, you can make one additional attack as a bonus action. 

In addition, starting at 7th level, your movement speed increases by 10 feet.  

Stamina Increase

Starting at 10th level, you have two uses of your Second Wind feature, and you regain both uses after a short or long rest. In addition, when you use your Second Wind feature, you regain an additional 1d10 hit points. 

Also starting at 10th level, non-magical difficult terrain doesn't slow your movement, and you can get up from Prone using 5 feet of movement, rather than half your movement. 

Improved Adrenaline Rush

Starting at 15th level, when you use your Second Wind feature, you regain an additional 1d10 hit points, (a total of 3d10) and your jumping distance is doubled until the end of your turn. 

Athletic Stature

Starting at 18th level, both your Strength and Dexterity scores increase by 2, to a maximum of 22. In addition, you gain a third use of Second wind, and you regain all uses after a short or long rest.