Forbes - - Technology -

Pump­ing iron has al­ways en­tailed stack­ing metal discs the size of

man­hole cov­ers (or, um, salad plates) un­til the re­sis­tance seems right, then adding and sub­tract­ing to find the Goldilocks zone. Tonal ($2,995; tonal.com) wants to change that. “Weights have never been dig­i­tized,” says founder Aly Orady. They’re hard to lift, thanks to grav­i­ta­tional pull, so Tonal repli­cated

that sen­sa­tion with a ca­ble sys­tem that drags mag­nets through an elec­tro­mag­netic field, pro­vid­ing re­sis­tance mi­nus the bulky bar­bell ca­pa­ble of crush­ing your rib cage. Tonal’s ca­bles make al­most any strength-train­ing work­out pos­si­ble, and

once you’re done, fold them up into the Tonal ma­chine, which re­sem­bles a 50-inch wall-mounted HDTV tipped on its end. The $49-a-month sub­scrip­tion (manda­tory the first year) gets you work­out coach­ing and

how-to classes. One ex­tra ben­e­fit: Tonal can feel when you’re slow­ing down and ad­just so you fin­ish your work­out, at ap­pro­pri­ate re­sis­tance, ev­ery time. In­evitable, we guess: The dig­i­tal rev­o­lu­tion has fi­nally pro­duced the smart


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