MINIMUM. After pure cbd tincture a warm-up series, I make a heavy series until muscle failure. Then, since the calf area is ready due to this first series of standing heel lifts, I step to the s pure cbd tincture ting heel lifts, also until I reach the fault. That's all for me. RULE NUMBER 12: KEEP YOUR REPET pure cbd tincture IONS TO MINIMUM. My first and only series for each exercise is 8 to 10 reps. This is the days when I think my calves need more training. In those cases, I do whatever I can or can do to reach the point where they.