Researching the subject, I’ve found some interesting content on Youtube. The Reg Park Chest Expander Program (below) seems to be a great introduction.
Did this program, and must admit I’m humbled by the feel of the chest expander. The strength curve is different than resistance bands, more smooth or defined - Where RB gets really tight in the stretched position, the spring derived tension of the chest expander is more evenly distributed.
Also, on second thought, my czech device is a sturdy construction, that does not bend or fail any provocation. Not sure how much force it produces, but I would say it feels like around 44 lbs in the most stretched position with the 2 springs attached.
Now, I tried this the day after a heavy powerlifting session yesterday, and it was like the perfect light accessory workout for arms, shoulders and upper back. It felt great, to be honest!
