Intensity, Frequency, and Volume
Training intensity – The amount of effort you put forth in your workout. It is how hard you are exerting yourself relative to your max effort.
Frequency – How often you workout.
Volume – How much exercise you do; e.g., 500 push ups is more volume than 200 push ups.
These 3 variables need to be balanced. HIgher training intensity and volume means you need to decrease frequency. Higher frequency; i.e., daily training, means you need to decrease intensity and possibly volume.
These variables should be manipulated in order to protect you from injury and over training. If love high intensity training but still want to train 6-7 days per week, check out my post on active recovery.