Final answer:
The correct form of the verb soler to complete the sentence is suelo.
Step-by-step explanation:
The correct form of the verb soler to complete the sentence is suelo.
The sentence should read: Yo suelo correr en el parque porque no me gusta el gimnasio.
The stem-changing verb soler is conjugated in the present tense as follows: yo suelo, tú sueles, él/ella/usted suele, nosotros/nosotras solemos, vosotros/vosotras soléis, ellos/ellas/ustedes suelen.
Learn more about Spanish verbs conjugation