Day with AI: Fitness App, Security Course, and a Static Site — Three Projects in One Day.

What I worked on

Thursday. One of those days where everything lands at once — three completely different projects from morning to night.

What I did

Fitness app — complete rebuild

Biggest chunk of the day. Took an existing fitness app and rebuilt it from scratch. New design system, four-day training plan, AI coach, meal plan with supplements, countdown timer, and PWA support. From "it kind of works" to "I'd actually open this every day." Without AI? At least a week. With AI? Four hours.

Interactive security course

Complete web application with 12 chapters on online security. Each chapter has a quiz so you can verify understanding. Passwords, phishing, two-factor auth, social engineering — all explained clearly with interactive testing. From zero to deployed in about an hour.

Legacy site — static build and deploy

An older web project that needed its hero section photos fixed and a case-sensitivity bug resolved. Classic problem — works locally, breaks on the server. Plus setting up the deploy script.

AI images and videos — prompt tuning

Session focused on getting better results from generative models. Rules for composition, lighting, aspect ratios, and expression stability for follow-up animation. Practical know-how useful for the entire content pipeline.

Cold email pipeline

Morning automated run. Scraping, data enrichment, draft generation. Runs in the background.

Time: AI vs without AI

Task	Without AI	With AI

Fitness app — complete rebuild	8+ days	~4h
Security course (12 chapters + quizzes)	8+ days	~1h
Legacy site — fix + deploy	3-4h	~2h
AI prompts — images and videos	2-3h	~1h
Cold email pipeline	—	~10min
Total	~20 days	~8h

What I learned

• Three completely different projects in a day isn't a problem when you have AI as a copilot — context switching hurts much less
• Case-sensitivity bugs are sneaky — works on Mac, breaks on Linux. Always test on the target environment
• Interactive courses with quizzes get much higher engagement than static text — and with AI you create them in a fraction of the time
• A fitness app with an AI coach is an interesting use case — training personalization is exactly the kind of task where AI excels