Yup depends on what you are aiming for. I always warm up on a spin bike before weights, but it’s just that, spinning to get warm, sometimes I zone out and start doing intervals 😉 – but the purpose is always just to get warm, not as an end in itself. Certainly I can’t do the thing I see lots of gym users doing which is walk in cold and start pumping massive weights. But then I do use a Uni gym and you get all sorts, plus the students are just coming back so we’ve got at least a month of lads hanging out in groups in sleeveless tops, getting in the way until they get bored and find something else to do….
Oh and the colds thing from the other thread – you are defo more vulnerable just after exercise to picking up stuff – speaking from experience, am very careful especially around this time of year which is when people start coughing and spluttering 😯