Pull ups are also a decent bicep workout, Not just chin-ups.
And biceps need not have to be the main muscle involved in an exercise to be worked out hard.
for example, upper traps are just stabilizers in deadlift but deadlifts are the biggest trap builders.
i understand your question, but my answer is pullups and chin-ups are enough.
maybe add inverted rows if you want variety.
and tug of war is a really great bicep workout.
maybe ,get some friends or a brother if you have, to play tug of war with you.
And also ,Bulgarian split squats can be added to your lower body workout.
DeFrancosTraining.com - Bulgarian split squats w/ added ROMI was thinking, maybe you can do strongman training. it works out all the muscles in your body and is also pretty cheap .
read this article -
http://www.defrancostraining.com/articles/38-articles/62-strongman-training-for-athletes.htmland here creativity can do quite a lot , doing farmers walk with a suit case filled with bricks is no inferior to those costly equipments
