the app looks same or similar to fitness apps. As myself I found the apps difficult in managing while doing exercises because you have to constantly do this in phone. I prefer not to .So build something where it would not require manual efforts or minimum manual effort.

Fair - I hate touching the phone between sets too. Right now the app keeps it minimal: photo for meals, quick-tap for workouts. But "zero effort while exercising" is the direction. What would work best for you - logging the whole workout once at the end, or voice/watch input mid-session? Asking because this decides what I build next.