It's possible you might be referring to:
* Double-ended resistance bands: These bands are designed to be attached to a fixed point on one end and a foot or hand on the other. They offer resistance in both directions of movement.
* Dual resistance machines: Some weight machines have two separate resistance stacks that can be adjusted independently, offering a more versatile workout. However, this wouldn't be referred to as "double positive."
* Compound exercises: These exercises engage multiple muscle groups at once, leading to more overall muscle activation. This could be described as "positive" in the sense of being beneficial, but not necessarily "double positive."
To better understand what you're looking for, please provide more context or a specific example.
