Casio Upgrades Its First G-Shock Digital Watch With Heart Rate Monitoring and Fitness Tracking
Andrew Liszewski
Gizmodo![g-shock](https://i.kinja-img.com/gawker-media/image/upload/s--Ne9aYW6Y--/c_fit,fl_progressive,q_80,w_636/0414c7c3adf32b4f4b5b842abc2d17e0.jpg?w=1920)
This month is the 40th anniversary of the original G-Shock digital watch, and to help mark the occasion, Casio is releasing a bunch of variants based on the original design, including a model that packs it full of modern fitness-tracking technology and an optical heart rate monitor.
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