There has to be a low tech solution, like can I just try to breathe in with my mouth closed? Or breathe in through a plastic straw & pinch it? I really prefer

There has to be a low tech solution, like can I just try to breathe in with my mouth closed? Or breathe in through a plastic straw & pinch it? I really prefer calisthenics, I'd imagine the breathing exercises singers do are probably the best. It's also hard to believe any of the published findings of gimmicky devices like this [1]. Another paper says it doesn't provide any benefit [2], but then I question this paper, they only did 3 days. It takes me about of month of muscle training to really notice any effect. And now I feel I've already gave the POWERBreathe® too much attention then it deserves. ;) [1] https://www.mdpi.com/1648-9144/57/1/72 https://www.mdpi.com/1648-9144/57/1/72 [2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4306778/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4306778/