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Anonymous
I'll answer for the chest expanders.
Chest expanders don't really target the chest muscles, they hit the lateral and posterior deltoids, and to a lesser extent the rotator cuff muscles, the infraspinatus and teres minor. Why the device gets the title of 'chest expander' though is because it does just that, the muscles that are listed above when strengthened help pull the shoulders and shoulder girdle back, giving the appearance of a puffed out chest.
So, 1) Hold it out in front of your chest with both hands like in a dumbbell bench press, and pull the handles out to the side, like in this video starting at second 16:
http://www.youtube.com/watch?v=qP8_GmJjrcI&feature=related
2) No, they don't go down far enough to be effective for a deadlift. But they're decent for bicep curls.
3) Do them for reps
4) Depends on what kind of resistance they are. When my grandpa passed on, he left to my dad a whole bunch of old school training devices. The spring loaded chest expander he left my dad, which is now mine, is hard has hell to pull, but the ones they have at my college gym, made out of rubber tubing, are ridiculously easy to open. They're more for rehab though, so I guess it's unfair to compare them.
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