Your persistent training with your fists has sharpened your reflexes and empowered your strikes in the following ways:

• Whenever an enemy misses you with an attack, you may use your reaction to perform an opportunity unarmed attack. If you possess the feature, you may replace this opportunity attack with a use of Flurry of Blows, spending Ki as usual.
• At the beginning of your turn, each creature that is grappled by you takes bludgeoning damage equal to one roll of your martial arts die or 1d4 if you are not a monk.
• You have advantage on all Strength (Athletics) checks made to escape a grapple.