I just finished my first ever Sims 4 mod - the Reverse Treadmill!
Instead of causing sims to lose weight, this custom treadmill (which is a clone of an existing model) causes sims who use it to gain! I set the rate of gain for the default “Reverse Workout” interaction to be twice as fast as the rate of loss for a normal treadmill, this can be modified with RoBurkey or by going into the mod file (just change the “commodity_fitness_fat” amount around line 233 in the reverse_treadmill_Workout file from 0.2 to whatever you like).
Pushing the limit causes an increase in the rate of gain, usually by around 50%. Some of the advanced interactions that are locked behind the fitness skill (endurance run, hill climb, etc.) also increase the gain rate significantly (as high as 0.5, or 0.7 for pushing the limit).
The treadmill still affects energy, fatigue, hygiene, and fitness skill normally. I considered adding a “fatness” counterpart skill to fitness but that’s way outside the scope of this project; perhaps some other time. Workouts on the treadmill also still count towards career progression for fitness-related jobs, so no more needing to overeat to compensate for your sim astronaut or soldier’s required workouts!
If you have any issues, questions or comments feel free to reach out below. I’m excited to hear what everyone thinks! If people want I would be willing to adjust the gain rate.
Download link: ReverseTreadmill v. 1.0