Downloading iMuscle 3.9.8 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. The program lies within Lifestyle Tools, more precisely Healthcare & Fitness.
The actual developer of this software for Mac is 3D4Medical.com, LLC. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software.
From the developer:
iMuscle 2 is a highly visual, award winning health and fitness app that has everything you need to plan and track your fitness program.
It provides users with the ability to zoom into an area on our 3D human body and tap on a muscle to reveal exercises and stretches targeted to the development and/or rehabilitation of that specific muscle. Once identified, just add it to a workout.
You may want to check out more Mac applications, such as iMuscle 2, which might be similar to iMuscle.