Welltrainer is personal trainer software to build workouts, run fitness assessments and charge clients, with a free app for the trainer's clients. Trainers create workouts from scratch, from templates or with an AI assistant, plan periodization, run physical assessments, health questionnaires (anamnesis and PAR-Q) and diet plans, manage their schedule and group classes, and receive payments via Pix or credit card with digital contracts. Clients follow their workouts in their own app on iPhone, Android or the web, log loads and reps, and talk to the trainer. Made in Brazil, in Portuguese, for in-person personal trainers, online coaches and running coaches.