Fitness?

The travel card isn't the only 60+ benefit recently acquired... the local fitness centres also offer great discounts to us "oldies" so I've signed up for these too. A couple of "silver aerobics" classes have left me in no doubt of my un-fitness. Wonder if I have any muscles which AREN'T aching... Must try to persevere though - but hard to keep on walking to the classes when I can get a free bus ride!!