Getting Rid of Nut Grass?
Most grasses can be covered with a tarp in the heat of summer and then scratch out the roots since many can just be driven into dormancy, but at least they will be easier to remove in this state.
Using Kettlebells
I do CrossFit and use these for some Tabata torture. I find a heavier weight lightens the intensity. I normally swing a 30#, so I upgrade to a 50# for tabata rounds. Have someone trained check your form. Otherwise you could really hurt yourself. More on the...