Resistance training, both using weights and resistance bands, puts your body under a greater amount of force when you exercise, working your muscles harder than when using just your body weight.

The POPSUGAR 3-in-1 Resistance Cord offers three levels — light, medium, and heavy — to strengthen the arms, abs, legs, and butt. You can get it at Target.

Keith Holmes shows off the RS-1, the compression shirt-resistance band hybrid he debuted in January. (Sammy Mayo Jr.) Former world boxing champ Keith Holmes recognizes a hit when he sees one. So ...