The infinitive (dictionary form) of some verbs ends in -arsi, -ersi or -irsi:
chiamarsi
| to be called
| abbronzarsi
| to get tanned
| divertirsi
| to enjoy oneself
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These are called reflexive verbs, with an additional mi, ti, or si which corresponds to the English "myself, yourself, him/herself".
riposarsi: Ho bisogno di riposarmi
| to rest (oneself): I need to rest (myself)
| chiamarsi: Come ti chiami?
| to be called, lit to call oneself What's your name? lit How do you call yourself?
| tenersi in forma: Io nuoto per tenermi in forma
| to keep (oneself) fit: I swim to keep (myself) fit
| divertirsi: Sono qui per divertirmi
| enjoy oneself: I'm here to enjoy myself
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