One could argue that Tenga have been helping their customers work out since the sex toy company was founded. Their latest product is made with building muscle in mind, and not just in one arm.

The Japanese onahole legends are no strangers to goofy marketing stunts, from furniture made for beating your meat on to figures combining their signature Vacuum Cup with famous mecha. But the aptly named Tenga Workout Gear isn't just a simple PR gimmick. 

At first glance, the TWG looks like a standard Vacuum Cup in shape, just a little bigger and painted silver. In reality it weighs over 11 times more than the Vacuum Cup, specifically 4kg (8.8lbs) due to the cast iron build. That's right, it's a dumbbell made to look like a sex toy. Tenga are even suggesting tailor-made routines you can do with a Tenga Workout Gear or two.

"One-handed Destroyer "indeed

The Workout Gears are made in Fukuyama by metalworking company Castem, as you can see in this little behind-the scenes video. I don't know about you, but I think watching a group of highly-skilled blacksmiths forge what looks like metallic onaholes is kinda hilarious. That said, it encapsulates the care and effort behind these dumbbells, showing that this isn't just another marketing stunt.

If you were disappointed that you couldn't (safely) fuck the Tenga sofa and mecha figures, then have I got news for you! This video demonstrates the USP the Tenga Workout Gear has over any other dumbbell on the market: you can open it up, stick a Vacuum Cup in there and get buff while you beat off. Fitness lovers should be sure to switch arms every now and then so you don't end up looking like a Bandersnatch from Resident Evil. 

The Tenga Workout Gear is available from Tenga's online store at ¥55,000 ($520 US), with a limit of 9 per order. You can also get the Tenga Body Charge energy gel to really maximize those gains.

What do you guys think? Would you buy one to improve your workout routine? Can you imagine sticking your dick in a dumbbell? Sound off below!