No pain, no gain, no idea what half these terms mean.
A movement or individual relying excessively on quadriceps muscles rather than posterior chain (hamstrings/glutes), often from poor technique or imbalance. It's the fitness equivalent of being a one-trick pony.
Twenty-five-cent coins that were the standard currency for playing arcade games, slot machines, and other coin-operated entertainment devices. A crucial commodity for arcade-goers throughout the 20th century.
An extinct subspecies of the plains zebra (Equus quagga quagga) native to South Africa, which had stripes only on the front half of its body, distinguishing it from other zebra species.