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LiftEngine
Workout plans tuned to your goals, kit and schedule
You describe your goals, equipment and training days. A constraint-based solver rules out anything infeasible: recovery windows, equipment you don't own, time limits. A genetic algorithm evaluates the rest against ten training-quality criteria (progressive overload, muscle balance, compound-to-isolation ratio and others) and evolves them toward the best fit. Exercises in each session are ordered by modality so warm-up, main work and cool-down fall in place. Free, no sign-up, six languages.
LiftEngine started from a specific frustration with existing workout apps: almost all gate the actual plan behind a sign-up or subscription, and if you do get through then the "personalised" plan is invariably a fixed template. At best they may have a few exercises lopped off to meet time/equipment constraints.
I wanted something that took my real constraints - equipment, training days, session length - and produces a plan that fits whilst following a science-based methodology.
The approach I settled on comes in two parts. A constraint solver handles the hard rules (recovery windows, equipment you own, time budgets) so the output is always feasible. A genetic algorithm then optimises the feasible plans against training-quality criteria I pulled from the literature.
The GA part was probably the most challenging. This initially utilised the (excellent) eaopt library, but ended up adopting a custom GA engine tailored to the problem that brought memory usage per request down to ~25 MB and cut plan generation to ~1200ms.
This is a side project and I'm still iterating. Happy to hear what works, or doesn't, as well as any feature requests.
About LiftEngine on Product Hunt
“Workout plans tuned to your goals, kit and schedule”
LiftEngine was submitted on Product Hunt and earned 3 upvotes and 1 comments, placing #126 on the daily leaderboard. You describe your goals, equipment and training days. A constraint-based solver rules out anything infeasible: recovery windows, equipment you don't own, time limits. A genetic algorithm evaluates the rest against ten training-quality criteria (progressive overload, muscle balance, compound-to-isolation ratio and others) and evolves them toward the best fit. Exercises in each session are ordered by modality so warm-up, main work and cool-down fall in place. Free, no sign-up, six languages.
On the analytics side, LiftEngine competes within Health & Fitness, Fitness and Weightlifiting — topics that collectively have 84.7k followers on Product Hunt. The dashboard above tracks how LiftEngine performed against the three products that launched closest to it on the same day.
Who hunted LiftEngine?
LiftEngine was hunted by Matt. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of LiftEngine including community comment highlights and product details, visit the product overview.
Matt