If you have knee soreness after working out, then you should probably focus more on muscle strengthening exercises. (md-health.com)
In addition, at least 2 days per week of moderate to high intensity muscle strengthening activity involving all major muscle groups can provide further health benefits. (bostonmamas.com)
If you enjoy running and / or jump rope, be sure to include some leg / knee muscle strengthening as well as hip flexibility routines several times per week. (fitbodyhq.com)