Xeno Mueller is promoting an interesting upgrade for Concept2 ergs that makes the seat yaw and roll, mimicking the set-up physics of an actual shell. This would be great for developing core strength, but I cannot believe the shipping is nearly as much as the product.
“CP1 is a stability adjustable rowing seat attachment designed for Concept 2
“C” and “D” model ergometers that attaches underneath the Concept 2 factory seat.
The first ever adjustable stability seat, CP1 is designed to optimize athletes’ ergometer training by incorporating the multi-planar movements that challenge athletes during (on the water) rowing.”