You can get a decent training program from an AI in about five minutes now, and you don't need to pay for it. This is a guide to doing that well: what to tell it, what to check before you follow it, and the point at which a free plan stops being enough. Disclosure: we make AirFit Coach, which has a free program; we'll say when that shapes an opinion.
What a good program needs from you
An AI program is only as good as its inputs. Before you ask anything to build one, have answers for five things:
- The goal, in one line. "Get stronger on the big lifts", "lose fat without losing the gym", "be able to run 5k". Two goals at once produces a program that half-serves both.
- Your week, honestly. How many days you will actually train, and how long a session can run. Three real days beats five imaginary ones.
- Your equipment. Bodyweight only, a home rack, a commercial gym. A program that assumes a cable stack you don't have is a program you'll skip.
- Your experience. Months or years of consistent training, not the date you first bought a membership.
- Anything that hurts. An AI should plan around a bad shoulder, not through it — and if something is injured, the answer is a clinician, not a program.
What to check before you trust it
- Are the exercises real? Generic chatbots invent movements or mislabel them. A program should come from a verified exercise library with a demo of each movement, so "Romanian deadlift" means the same thing to you and to it.
- Does it fit the constraints you gave? Count the days. Time a session on paper. If it ignored your equipment or your week, it will ignore your knees.
- Is there progression? A list of exercises is a workout. A program says what changes in week three. Look for sets, reps and load moving over time, not the same page repeated.
- Do you approve it, or does it just start? The good tools show you the program before it's yours and let you change your mind. That's also the sign the tool respects the next point.
- Does it know what it isn't? Fitness programming is not medical care, physical therapy or nutrition therapy. A tool that claims to treat something is the one to walk away from.
What a free plan can do
Quite a lot. A well-built program lasts six to eight weeks before it stops driving progress, and a free plan that rebuilds every 8 weeks covers the whole first year of a beginner's training. Log every session — the log is where the progress is — and keep the check-ins even if nobody reads them, because you will, when you rebuild. AirFit Coach's free program works exactly this way: a program, a meal plan and a daily routine from your answers, rebuilt every 8 weeks, logging included, no card.
When to pay for a coach
The free plan's limit is not the program; it's the week. A program can't see that you missed two sessions, that your squat stalled, or that you've been sleeping five hours. A weekly coach — human or the paid AI kind — reads your check-in and changes the plan before the block goes stale. Pay for that when one of these is true:
- You've stalled on the same numbers for three weeks.
- Your schedule changes week to week and the plan keeps not fitting.
- You want the plan to react to what you report, not wait 8 weeks for a rebuild.
- You'd train more consistently if someone was going to read the check-in.
The paid AirFit Coach is $19/month after a 7-day trial, and the honest pitch is that you can add it for a month when a block stalls and drop back to the free plan when it doesn't. A human coach costs more and sees more; if you want one, the trainer directory is where to look, and your history comes with you.