This mod will conflict with other mods, and these others must be removed when using this one.
The conflicting mods I find right now are:

My Stereo Mp3 Sound Volume mod
TFM's Wired Speakers Don't Wake Sims
TFM's Lose Weight Gain Fitness Slower
Blue's No Athletic Skill While Swimming (both mods with Swimming)

There are 2 flavors of this mod now with the 1.50, use one or the other. The 2nd one, titled SE, adds my Stereo MP3 Sound Volume mod into this mod here.

ShimrodsNoMuscleGain155.rar
ShimrodsNoMuscleGainSE155.rar

These two below add the Ballet Bar into this mod, as asked about below. Otherwise the mod is exactly the same as the ones marked 155.

ShimrodsNoMuscleGain163.rar
ShimrodsNoMuscleGainSE163.rar

Created with the use of s3pe by Peter L. Jones.
ShimrodsNoMuscleGain138.rar
ShimrodsNoMuscleGain142.rar
ShimrodsNoMuscleGain150.rar
ShimrodsNoMuscleGainSE150.rar