Jogging is running slowly and steadily for exercise. Not racing anybody, including yourself.
The pace is the whole definition, and the boundary with running is entirely a matter of self-description, since one person's jog is another's sprint. It became a mass activity in the 1970s and brought jogging bottoms and jogging shoes with it. The verb is jog, which also means to nudge, and jogging somebody's memory means prompting them, from that quite separate sense of a small push.
1nounjoggingRunning at a slow steady pace as exercise.
“She took up jogging after the operation.”
Middle English
joggen
English
jog
English, today
jogging
Built from
From jog + -ing. jog Of unknown origin. Originally with the meaning of "to shake up and down." Possibly from Middle English joggen, a variant of jaggen (“to pierce, prod, stir up, arouse”); see jag (“sharp projection”). Or, perhaps an early alteration of English shog (“to jolt, shake; depart, go”), from Middle English shoggen, schoggen (“to shake up and down, jog”), from Middle Dutch schocken (“to jolt, bounce”) or Middle Low German schoggen, schocken (“to shog”), ultimately from Proto-West Germanic skukkōn (“to move, shake, tremble”), possibly related to skakan (“to shake, stir”). More at shock.
Etymology from Wiktionary, CC BY-SA