Ask celebrity trainer and Lift to Get Lean author Holly Perkins what the very best move is to strengthen and tone your arms, legs, butt, or [insert your trouble zone here], and she'll respond honestly: there's no single "best" exercise for any part of your body. Instead, she insists that every strength-training exercise can work your entire body; you just have to set up correctly. Utilize Holly's five-step checklist to build every move from the ground up and achieve the results you're after. I worked out with Holly last weekend as part of Westin Wellness Escapes, and I definitely felt the difference — I've still got the sore muscles to prove it! Whether you love to lift dumbbells, swing kettlebells, work weight machines, or use your body's weight, these minor changes will have a big impact on your strength-training results.