An average Ukrainian soldier is 43 yo. and gets 3 to 14 days of training. They do not much else than sit in the trench, get bombarded, and be scared.
There are some soldiers who get into a mechanized brigade, they get more training but they also don't do much else than sit in the trench, get bombarded, and be scared.
And there are a couple of mechanized brigades that has an assault battalion, those do the heavy lifting. Some of them are infantrymen, but some from other arms, such as armor.