I'm open to all modes eh, but I think indoor run and bike, got
aircon, music, and no sun so no blemishes lah. Conditions
constant.
If run outside, wait got pek pan, or pan (blemishes, freckles,
blah, blah) then got to go for that crystalize treatments. External
conditions not constant, wait got rain, got wind, got traffic,
errr....what else?
I guess to each his own. 