It depends on how ambitious they are.
This post has a ton of information on an existing athletic profile that you might find helpful:
https://www.dcurbanmom.com/jforum/posts/list/50/1214129.page
Some good examples:
Activities List Example 2: Student Admitted to Northwestern Class of 2028
1. Athletics: Synchronized Swimming, 3x Int’l Medalist, 7x Nat’l Medalist
20 hr/wk, 46 wk/yr. Premiere state team; elite top 3 nat’l team; US Jr Olympics 2022 - Gold x3, Silver; US Nationals 2022 - Bronze; 2023: Silver, Bronze; leadership award
2. Research: Prevalence of Anxiety/Depression in Artistic Swimmers 13-18
2 hr/wk, 36 wk/yr. Study author. Design/analyze survey of medicated depression 8.5% athletes vs 16% gen teens (p<.05); poster presentation; submitted NHSJS
3. Volunteer: Accredited SAT & Math Tutor, Free Online Int’l Peer Tutoring
1 hr/wk, 20 wk/yr. Facilitate critical thinking skills; mentor/enlighten 52 learners, 18 countries; assist in raising SAT scores on avg. by 50 pts
4. Social Justice: Founder & Fundraiser, Paws of Ukraine
1 hr/wk, 26 wk/yr. Aid war-displaced animals. Launch/manage non-profit; fundraise; crochet 100 collars/toys; 3 fairs, feature on UAnimals webpage; raised > $2000
5. Work: Private Artistic Swim Coach/Camp Counselor
1 hr/wk, 40 wk/yr. Coach 12 athletes' skill development up 2 levels; mentor 60 preteens to foster creativity/growth mindset; instill a passion for learning/exploration
6. Tech: Opi-O-Scope Prototype Developer, Stanford Clinical Neurosci Immersion
30 hr/wk, 2 wk/yr. Capstone project of AI injectable nanobot monitoring neurotransmitter levels to prevent opioid relapses; prototype development offer.
7. Career: Econ & Leadership Ambassador, Econ for Leaders 2023
30 hr/wk, 1 wk/yr. Selected to promote econ. education; enhance leadership/public speaking skills; network; integrate econ. analysis/decision-making; social media promotion
8. Academic: Author of Academic Papers on Mental Health
4 hr/wk, 12 wk/yr. Published: [redacted]. Criticize policies on access to rural health care; analyze US history of mental health stigma; explore correlation of social media & mental health
9. Foreign Language: Ukrainian; Ukrainian Catholic University & Duolingo
2 hr/wk, 46 wk/yr. Master Duolingo in 6 months; increasing proficiency with weekly online tutor, including discussions of history, culture, and politics of region
10. Athletics: Swim, Long Distance Free and Relay Athlete, Varsity Swim Team
4 hr/wk, 12 wk/yr. Region champs 2022; endurance specialist; contribute personal best 200(2:10:06) and 500(5:45:40) free; collaborate on relays; inflate morale