found this about felxisins on SW website...
[FONT=Arial, Helvetica, sans-serif][FONT=Arial, Helvetica, sans-serif]Most slimmers are happy with the idea of cutting down beforehand or compensating afterwards. Maybe that's because they can see the logic of it, or because they feel they must 'pay' or suffer for their pleasures. But at Slimming World we don't believe in suffering! We take flexibility much further: we believe that sometimes flexibility means doubling or even trebling your Syns for the day - without paying![/FONT][/FONT]
[FONT=Arial, Helvetica, sans-serif]Ask a dedicated slimmer to be really flexible - to have maybe 30 Syns for a day, without compensating before or after - and you'll often see a look of shock and disbelief.
But trust me, the most common reason for failure I've found has been lack of flexibility. Over-rigid adherence to any slimming plan has been the ultimate cause of many a slimmer's downfall. That's when 'diet' becomes a four-letter word. That's when that weight that you swore you would never regain comes creeping back.[/FONT]