Hey there @ElSopero! Welcome to the community! So movement acceleration is actually already built into the character class, so technically you could use that system by increasing the max player speed and adjusting the acceleration during the boost.
Or if you’d like to handle it yourself for more curve based control of a speed ramp up you could use a timeline:
Though depending on if you’ll have other speed modifiers, modifying the speed directly isn’t always the right move. Timeline is also not strictly necessary, you could also just increase or decrease max walk speed on tick and clamp it at the maximum you’d like.