For those aged 65 and over, walking at any pace was included if the effort was enough to make them breathe faster, feel warm or sweat.
I'r rhai 65 oed a throsodd, cafodd cerdded ar unrhyw gyflymder ei gynnwys os oedd yr ymdrech yn ddigon i wneud iddynt anadlu'n gyflymach, teimlo'n gynnes neu chwysu.