New on trac Antares rollers low watts?

Hi all,

New to all this but so looking forward to it, but looking for a bit of help please.

Using my bike on standard rollers with speed and cadence sensors fitted (they are being detected) but peddling like mad and the watts are only about 28 and the speed about 4 or 5. I have checked the wheel size and personal details are entered correctly…any ideas anyone please?