Space: Whenever you play bottom in Jiu jitsu a requirement for you to be effective is enough space between you and your for you to be able to freely into your techniques. You seek a middle ground. Too much space and you won't be enough to actually apply techniques. Too little space and you won't have adequate room in which to move to get into your techniques. A good rule of thumb is that if you have space to bring one knee and elbow close together under an opponent while still maintaining – you have enough space to move and enough proximity to be effective. This state of affairs won't last long – a good top opponent will always seek to rob you of space – so once once you've created space it's time to get to work!