danger is if you think 'i'll use it wan...i'll watch tv and do it, i can do it IN MY OWN TIME, in my own COMFORT'...well, normally it comes down to you thinking 'aiya tomorrow la..tired today. the bike is there and it wont go anywhere. the bed looks....zzzzz' then it collects dust.
it comes down to your mental strength and determination i think. dont get me wrong not everyone follow this pattern hehe.
if u pay for gym, you will try your best to go and got ppl around and more social etc etc.
my $0.02

have u tried burpees? their great for quick workout and just need space and yourself
been doing them for quite some time now...since i stopped going to the gym.