Exercise 2
The next step is to be able to raise and lower your left hand while simultaneously beating a pattern with your right. This will be quite challenging at first, but practising drill-type exercises like the following will help.

Figure: score - 4/4, two bars of cresc and decresc plus right hand pattern

As you become more comfortable with these gestures, you need to start imagining using them in more difficult situations, such as showing a long crescendo or diminuendo, eg. for 8 bars, or 12 bars. This is more challenging in terms of controlling both the drawn-out gradation and also the smoothness of your left hand. You can try the previous exercise in 3/4 as well as in 2/4.