Kettlebell Step-ups are a great addition to your leg regimen. As much as I am a functional strength guy I am still a fan of barbell squats but I always look for ways to train the legs without putting too much stress and strain on the spine and reaping same or very similar strength benefits. Kettlebell step up is a very functional exercise that will not only strengthen your legs but will also strengthen your core. For this exercise you will need a plyobox and a kettlebell. A plyobox is one of the most useful tools in a gym and is a must have for your home gym. They can be easily made and you can search online for tips on how to make your own. Addition to using a kettlebell, you can do step ups with bodyweight only, sandbags or dumbells.