The first go-kart-racing track was a circle because it was designed to teach children how centripetal force feels without rolling them down hills in tires. Learn circularly with today’s Groupon at Umigo Racing in Livermore. Choose between the following options:

• For $15, you get one track session for one person (a $25 value) and a helmet head sock (a $5 value; a $30 total value). The value of this option may also be applied toward the $25 cost of certification for new drivers ages 10-15, if needed.
• For $55, you get one track session for four people (a $25 value each) and four helmet head socks (a $5 value each; a $120 total value).<p>

Umigo Racing sends adrenaline-seekers careening through its indoor track atop high-performance carts that hit speeds of up to 40 miles per hour. Umigo’s sleek black roadsters whiz effortlessly through hairpin turns, speedy straightaways, and electrifying highway tolls, kindling excitement whether in competition with racing companions or tearing by on a solo session. Upon arrival, drivers suit-up in a freshly laundered race suit and neck brace, swathing craniums in a brand-new head sock. Racers fly through up to 20 laps in a single session on the innovative course design, which transforms into one of 20 different configurations every two to three weeks to keep rubber-burners on their toes.