Age 12 to 13 - lawn mowing, pressure washing, cool sealant on roofs
13 - 14 construction worker (iron worker) helper for my dad, meanest SOB ever and made school not seem so bad. Painted for part of the summer.
15 auto detailing for a company
16 through college - auto detailing (personal business)
If working for my dad wasn't motivation, washing cars in the 32 degree weather was.
2 part time jobs in college and washed cars on weekends.
worked in a prison as a medical student as "the doc". Motivation to not get arrested. Made $150 for an overnight stay. The rats were as big as nutria.