^ bands give you an constant pull force...ONLY if you pull in the direction of the band. if you pull to the side, you kinda 'cheat' on the pull force. stepping on the band is not as accurate as free weights. how do you know that 10 inches from handle is 15 pound? good thing is, they are cheap and portable, great for travel.
free weights you can also 'cheat' by jerking it. also a lot of room is needed to store free weights (unless you get something like powerblocks or selecteck) and very expensive.
both do the work and will get you results. like red sky, i recommend free weights if you can get them.
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