Report Abuse. First of all - RCA's, Pre-amps, Pre-outs, or just Outputs are all common terms referring to a head units low/line level rca style outputs used to drive an amplifiers input.The most basic HU's just offer a single pair (left and right) of pre-amp outputs.eport Abuse. First of all - RCA's, Pre-amps, Pre-outs, or just Outputs are all common terms referring to a head units low/line level rca style outputs used to drive an amplifiers input.
An ideal cardio session should be around 45 minutes. If you lift weights before aerobic training, youâll only need 15-20 minutes of cardio. Youâll get the same benefits as you would do in 45 minutes without weight training.
This is energy your muscles would have normally used for weight lifting. So, when you go to lift weights in this state, your body will utilize protein for energy instead, and the protein it will use is from your muscles. So in essence, you're defeating the purpose of weight lifting by doing it after cardio. So, if you must do them on the same day, you should do cardio after weights. For maximum benifit, have a small fast uptake protein/carb supplement between the weights and cardio and wait a few minutes before starting - it would be a good time to do some deep stretches.