Strong.app - Strenght training logger.
Next! Fitness - A.I. powered gym
Hevy - Simple workout logging, insightful analytics, and a growing community of gym athletes.
Dualnback.works - Dual N-back is a specific brain training exercise, that's been shown by research - it might improve fluid intelligence.
Ewolo - A simple, flexible mobile-friendly workout logger & tracker
Praxis - Apprenticeship program and career accelerator