1. Present simple tense: Used throughout the answer (e.g., "They always get up," "They believe," "They often tell me"), which is appropriate for describing habits and routines.
2. Adverbial phrase: "at the crack of dawn" is used as an adverbial phrase to specify the time they wake up, adding detail and naturalness.
3. Relative clause: "which I find pretty impressive" is a non-defining relative clause, adding extra information about the previous statement in a natural, conversational way.
4. Use of modal verb: "is much healthier and gives them a head start" uses the present simple to express a general belief, which is common in spoken English.