Creating Manipulable Muscles for Arms and Legs in 3ds Max

Published on January 06, 2026 | Translated from Spanish
Digital muscle system on a 3D arm showing contraction via bones and constraints in 3ds Max.

When Your Characters Need a Virtual Gym 💪

Tired of characters with arms like broomsticks? With this basic muscle system, you can give them the volume and dynamism they so desperately need. And the best part: without turning your rig into an impossible-to-animate labyrinth.

The ABCs of Digital Muscles

To create muscles that contract logically:

  1. Create your main FK chain (arm/forearm bones)
  2. Add parallel muscle bones (2 per muscle)
  3. Configure the magic constraints:
    • Position Constraint on the end
    • Adjustable Look At Constraint
A good muscle rig is like a tailored suit: it must adapt to movement without wrinkling or limiting the action.

Tips for Killer Muscles

To make your setup shine:

Solutions for Common Problems

If your muscles misbehave:

Conclusion: Goodbye to Tube Arms 🎉

With this system, you'll have muscles that flex naturally, bringing your characters to life without driving you crazy in the process. And when it works perfectly, you might even mentally hear the sound of those biceps contracting.

Now all that's left is to add a controller for sweat... but that's asking too much, isn't it? 😅