And while both ventilatory threshold and maximum capacity can be slowly increased, people have to have enough positive experiences to stick with exercise over time so they actually can boost these limits.

WSJ: Hard-Wired to Hate Exercise?

Even though it is expected the great majority of owners will never have to use this enhanced warranty, we want each Nissan LEAF owner to have the security that should capacity loss exceed this defined threshold, Nissan will cover the repair or replacement of their battery under warranty.

ENGADGET: Nissan upgrades US Leaf warranties, will 'restore' batteries that lose too much charge

For most individuals, the ventilatory threshold is around 50% to 60% of the way to their maximum capacity, though there is tremendous individual variation.

WSJ: Hard-Wired to Hate Exercise?