I need some advice regaurding resistance bands. I am thinking of buying one of them (and only one probably). I want it to develop muscles. I am not able to perform bodyweight exercises properly as my muscles are weak (which is why I am thinking of buying a resistance band to develop them). I need advice regaurding what type (light ,medium or heavy) band I should buy. I dont want it to be too easy. I dont have access to free weights nor to gyms. I have seen some videos on resistance band exercises and it seems to be effective. Does anybody have any opinion/experience otherwise? Please help. Also which lenght resistance band will be ideal for me? I am 5 feet 5 inches and weight is about 60 kg.