A hygienic exercise equipment includes thermo plastic elastomer having a composition comprising bamboo charcoal powder, PVC, ZN-CA stabilizer, pour point depressant, ink and at least one of DOP and ATBC. Preferably, bamboo charcoal from 0.1% to 5%, PVC from 35% to 56%, ZN-CA stabilizer from 0.4% to 1.5%, pour point depressant from 0.5% to 1.5%, ink from 0% to 10%, and at least one of DOP and ATBC from 1.0% to 5%. The composition is mixed and tailored to various designs for different exercise equipment, different parts and different portion of the exercise equipment. The internal body in the weight trainer, due to being mixed with the solid powder, has an extremely high density ranging from 0.5 g/cm.sup.3 to 6 g/cm.sup.3, preferably ranging from 4 g/cm.sup.3 to 6 g/cm.sup.3, so the weight trainer can have a high weight, even if fitted into the internal body with small volume.