River's Workout Routine (5e)

You reach out towards a living creature, temporarily enhancing their body to better suit the task at hand.

The creature gains one of the following effects until the end of your next turn.
 * The creature’s muscles temporarily swell with strength. The creature has advantage on Strength checks and disadvantage on Dexterity checks.
 * The creature’s body becomes lithe and dexterous. The creature has advantage on Dexterity checks and disadvantage on Strength checks.
 * The creature’s body becomes rubbery and elastic. The creature’s melee attacks have an extra 5ft reach and they are capable of interacting with objects an extra 5 feet away from themselves. The character’s speed is also reduced by 5 feet

An unwilling creature must make a constitution save or be affected by the spell as normal.