You’ve developed the skills necessary to find a weakness in your opponent's movement, allowing you to find an opportune moment to grapple them with your knowledge and speed over your strength.

• You can substitute Strength (Athletics) with Dexterity (Athletics) or Dexterity (Acrobatics) when trying to grapple an opponent. 
• While you have a creature grappled you must maintain the grapple with Strength (Athletics) or with disadvantage if using the Strength/Dexterity (Acrobatics) ability. 
  • You may remove the disadvantage enforced by using (Acrobatics) by spending your reaction to readjust yourself while they try to break the grapple.
  • The reason: It may be easy to get your arms around an enemy for a moment, but it really comes down to your athletic ability to keep them in place.