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An Introduction to Gradient Descent and Linear Regression

Gradient descent is one of those “greatest hits” algorithms that can offer a new perspective for solving problems. Unfortunately, it’s rarely taught …

The Best Time to Post Tweets, Facebook Posts and More

<i>This post was originally published on the Buffer blog.</i><p>We’re pretty keen on optimal timing for social media here at Buffer, and I figured it was high time I collected all the information we have about online communication into one place. I’ve collected research and stats on Twitter, Facebook, email …

101 Bike Maintenance Tips Every Cyclist Should Know

Your guide to a longer cycling life—for your bicycle, your gear, even a few friendships<p>Your bicycle doesn’t run on leg power alone. It also needs a little lube, a lotta­ love, and a good ­listen. You may not know every remedy your bike needs to live a long life, but you can gain enough wisdom along …

England

Not quite an A, but a better report card for Udacity: online students’ scores improve

Advertisement<p>1 Comment<p>Credit: Stuart Miles<p>One month after San Jose State University (SJSU) suspended an online learning program with Udacity because …

Recipes for Success

How to match the pros—at the dinner table. —<i>Anne Stein</i>

Food

Guide to Power Meter Metrics

Riding with a power meter on your bike reveals a trove of information. Here’s what it all means for your training.<p><b>Power</b>Power is the rate at which energy is used (energy over time) and is measured in watts. In cycling, energy is expressed in terms of work (such as how hard you have to work to ascend …

Tour de France

Get acquainted with your derailleur for easier repairs and smoother shifts.<p>Few of us really appreciate how hardworking and integral the rear derailleur is until it stops functioning perfectly. Then you’re stuck with, at best, an imprecise and clattery ride. So the next time you climb with …

Eat to Ride

Three nutrition tips every cyclist should live by<p>Whenever I advise athletes about bike nutrition, I tell them that they don’t need a special diet to fuel performance. The one that’s best for health is also the one that’s best for strong results. If you want all your systems firing at 100 percent, …

Nutrition

How Calories Work

You eat, burn, and count them. Here’s how to master calories.<p><b>What They Are</b><br>A measurement of energy in food. Scientists estimate it using a formula that factors in a food’s macronutrient content. The key word here is estimate—things like fiber or how much a food is processed can affect calorie count. …

Core Values

Get faster with our midsection makeover—no crunches required<p>You probably know that a strong core is key to ­riding better. But you may be surprised that there’s more to your core than just abs, and that relying on crunches alone won’t do the trick. Too many cyclists forget the muscles that cycling …

Bodyweight Exercise

Bike-Washing Tips From the Pros

Five cleaning secrets from the experts<p>"Cut off the top of a plastic water bottle. Fill it with a water-based degreaser, like Simple Green, and place it in your seat-tube bottle cage (for easy access). Use a paintbrush to apply the degreaser to the chain. Finish by holding a soapy sponge around the …

Perfect Pedaling: Get a Better Pedal Stroke

Get the most energy from each crank revolution with these tips for proper pedaling<p>Pedaling in a simple circle is a complex thing, but mastering it can save energy, says Todd Carver, biomechanist at Colorado's Boulder Center for Sports Medicine. He says that with proper ankling (shown here; not the …

Swimming

Are You Fit to Ride?

Find out where your body needs a boost with these cycling-specific fitness assessments.<p>Too many cyclists with bulging quads still struggle with a squishy core, wobbly hips, or stiff shoulders. On the bright side, fixing those issues will make you a more efficient rider, says Darcy Norman, a trainer …

Freelancing