Working out on amphetamines is an quite a dumb thing to do. They raise both your blood pressure and heart rate and combined with heavy weight lifting(big blood pressure booster), you can put a hole in your heart.
Adderal raises BP more than Ephedrine btw.
The primary risk of the ECA stack is in the effect of ephedrine on the heart. Ephedrine has been linked to deaths in people with valve damage, heart problems and heart disease, but also in previously healthy young adults when taken in high doses.
It is not recommended that stimulants be taken in users with a pre-existing heart condition. Additionally, there is some evidence that the long term use of amphetamines can lead to heart damage, but this has not been shown for ephedrine use.
Caffeine and ephedrine also act to raise blood pressure by approximately 4?7 mmHg on average, so users with existing hypertension must be careful that the stack does not increase their blood pressure to dangerous levels ? especially during exercise (for example, by lifting exceptionally heavy weights).