Ok I just bought a set of resistance bands that offer up to 70 lb of resistance using this clip system: http://www.bodylastics.com/clipsystem.html My question is whether or not these are as effective as free weights? I'm getting these because they're portable and they offer some real resistance I suppose. I've been doing free weights for the last couple of months until my shoulder got injured (from grappling). I'm not looking for bodybuilder gains or anything. My long term goal is to probably get a body type like Masato's http://www.prokarateweekly.com/images/Masato Lim.JPG I usually only workout my shoulders, arms, abs, and back. For my chest I just do pushups. So I wonder if these are ample enough to do the job at home and such when I don't have time for the gym. Also, I'm also using these to rehab my shoulder. Thanks.