There is no way you can do what we do on a bike on a turbo trainer or rollers. There is a lot of upper body stuff going on, leaning back and forth and to each side and you simply don’t have the stability on a bike on a turbo trainer and certainly not rollers. It’s just not even in the same ball park. If you want to do proper spin stuff then you need a proper spinning bike.
IME there are two types of spin classes – ones like you’re doing, and clearly think are the only thing out there, where they get you doing press ups on the handlebars and crap like that which is of no use whatsoever for cycling, but helps the fatties that have dragged themselves to the gym to do exercise. There are also ‘proper’ cycling classes, which will give you far more benefit, and don’t include stupid upper body work which offers no benefit for cycling.
The former is very hard to recreate on a turbo, but pretty pointless. The latter is very easy to recreate on a turbo, and is more beneficial for cycling.
