It is not always easy to train as a berserker, or somaferan martial artist. We have no established schools. Our training methods are generally not welcome in most gyms. Many of us do not live in or near the woods. If you are in an area that is urban or suburban enough to not have any public space you could have a little privacy in, then you may be forced to train in your own home, for the most part, and on your own. Do not despair, though, there is still a lot you can do. I have used these techniques to train for more than one martial arts tournament, including some I won.
One of my favorite solo indoor exercises was hanging several coins or small rocks in a circle from the ceiling, using twine. I would stand amongst them and, using only my outstretched fingers, strike them all while standing in the middle. The key is to keep them all moving without letting any of them hit you, without leaving the circle. A good variant on this is blindfolding yourself first. This trains you to greater awareness of your other senses, and helps you develop a good spatial memory.
Bodyweight exercises are your friend! You know Charles Atlas’ work? This kind of exercise tends to build a lean, muscular fighter’s body without bulking up. Good for speed as well as strength.
Got a hallway? Use HIIT, or wind sprints. If you can, go jogging around the block a few times, on a regular basis. Developing endurance is the most important thing you can do as a fighter. Gentleman Jack Johnson, an old-time boxing champ, ONLY trained endurance, and simply outlasted all of his opponents.
Throw punches like in shadow boxing. Seriously. Doing thousands of punches, concentrating on your form, will do more for you as a fighter than almost anything else will. Aiming at your moving shadow will keep mixing it up, avoiding the problems that forms give.
Of course, this approach does require you to be able to elevate as a berserker inside, without bothering or freaking out your hosuemates, if any.