If you are using rollers on the rear wheels, you need to set the brake or lock the front wheel to keep the trike from moving forward when you start pedaling. On delta trikes (two wheels in the rear, one up front), you will need rollers under each of the rear wheels to do what you are wanting to do. The photo below is probably what you will want to look into unless the price scares you off. However, it's still cheaper than buying two of the single roller models and cheaper than most decent stationary exercise bikes. The other advantage is that you don't have to find extra room for your trike and a stationary bike.