In this video Scott Bugden explains the 3 things all cyclists need to get right in order to progress. Scott is a coach for the Swiss Cycling National Track Team, and is experienced in road, track and MTB XC disciplines.
Whether, its the latest aero helmet (/wheels/skinsuit/bars), nutrition products, powermeter etc. There are many potential distractions in the area of ‘marginal gains’. But in reality these interventions are going to have no benefit if you havent got the foundations right.