Marijuana helped keep me focus during exercise and I got healthy and lost weight, I like stimulant while exercising, need legal alternatives?

Breathing exercise. Doing breathing exercise - one type of yoga will improve brain to stay focused. Sage as tincture will improve oxygen levels in brain. B complex improves focus - probiotic generated b complex is better assimilated by the body. Chloroxygen tincture is made from stinging neetle add to water daily improves oxygen levels in brain - anything that improves oxygen to brain - awareness, walking will help.