If your knees get in the way of you lowering the dumbbells, point your legs more outward.
A group of muscles on the outside and sides of your lower arm.
Dumbbells
When gripping dumbbells, make sure you position your hands in the middle of the bar and not at the end next to the plates.
Flat Bench Without Rack
If you can't find this bench, consider using a flat bench with rack instead. If your exercise requires you to use a barbell or bar, you cannot substitute. If you do not need to use either, you probably can substitute.
Exercises that target the same primary muscle groups and require the same equipment.
Exercises that target the same primary muscle groups with different equipment