Your no-exercise policy is starting to endanger others: While waving sparklers last weekend you nearly TKO’ed a small child.Get those granny arms (and glutes and gams) toned with help from author-turned-personal trainer Leanne Shear.After assessing your exercise preferences, Shear creates a nonstop hour-long routine that she guides you through at the meet-up spot of your choice (a park, your gym, etc.). Hate sit-ups? She’ll concoct another way for it to hurt when you laugh, like cross-body movements with a medicine ball.Shear is relentless but peppy, and makes you want to soldier on even while windmilling your arms for three minutes or doing lunges on tiptoe. Other great motivators are the shame of grunting and whining in public and Shear’s envious muscle tone (she likes doing push-ups). But she’s no pushover: Even sitting down will hurt for days.Best part: Shear charges an astoundingly low flat rate of $40 per hour — and lets you split that up to four ways for mini group training. Plus, she e-mails you the routine so you can do it at home. Which might be the safest option, until you tighten up those triceps.For more information, go to leanneshear.com. Join a Fit and Flow class ($25) in Central Park on Thursday, 7-8:30 p.m. R.S.V.P. to firstname.lastname@example.org.Photo: KayVee.INC / FlickrUp to 60% off Linea PelleUp your accessorizing IQ with Linea Pelle’s artisan belts and bags. You’ll love the handmade brass hardware and vintagey fringe, buckles, and zippers. All are up to 60% off today on our sample sale site.