We've discussed this before. It's in the archives.
Simply put: >Designer molecules using unrecognizable epitopes, fully immunocompatable >undetectable synthetic hemoglobin analogs >recombinant 2,3-BPG. >lactate shuttle vans >cardiomyocyte gene therapy (adenovirus vector...ever wonder why these guys always have colds?) >AI-programmed collagen formulation for optimum tendon elastic modulus >pulmonary "deshunting" to increase alveolar ventilation and gas exchange >on the fly blood rheology optimization (third spaced component reservoirs with real time thromboelastography and dosage via voltage controlled lymphovenous valves) >Van Eck phreaking continuous heart rhythm analysis and optimization >Nanomanufacturing of carbon frames for piezoelectric "nanomotoring" >Implanted CN9/CN10 neuromodulators for heart rate control and carotid body baroreceptor decoupling >Allosteric enzymatic "supercharging" of the electron transport chain via synthetic mitochondrial infusion >genetic enhancement via crispr-cas9 >nanobot blood boosters with erythropoiesis stimulating nanoparticles