The recommendation is to do a combination of cardio, around 150 minutes a week with increased heart rate (or 75 minutes intense cardio) and weight training 2-3 times a week for optimal fitness. Even if you just want to become very good at running, some weight training is helpful. So the advice in this comic is accurate. However, doing anything is better than doing nothing so if just running is what makes you happy, do that and don’t stress.
The recommendation is to do a combination of cardio, around 150 minutes a week with increased heart rate (or 75 minutes intense cardio) and weight training 2-3 times a week for optimal fitness. Even if you just want to become very good at running, some weight training is helpful. So the advice in this comic is accurate. However, doing anything is better than doing nothing so if just running is what makes you happy, do that and don’t stress.