Kettlebells work better than dumbbells for flyes. Because of the position of the resistance, the pecs are under load for a greater proportion of the range of motion.
With dumbbells, the muscle tension on the pecs is greatly reduced at about 60% of the range of motion. This can make the reps less effective, especially when you're using a method where you must maintain constant tension to create an occlusion effect.
The easy-peasy push-up gets a heck of a lot more challenging once you remove a hand from the equation. Here are some tips on mastering this old-school feat of strength.
A lot of you have been training for years, and as such have experimented with dozens of training methods. Most are probably long since forgotten, like the girl with the braces and padded bra that you dated once or twice back in high school. There wasn't any chemistry and you went your separate ways.