>>87097290You need your body to get used to a constant load of effort, so my best recommendation would be to start from a given amount of reps to an exercise (let's day 5 per example), and then add one as soon as you start feeling like you're comfortable with that range of reps (don't know if I'm really clear here, but basically, just slowly add to a simple base). Also, don't forget that at least half of your workouts are accomplished by a good rest and enough nutrients in your food (does suck but sadly it's true).
To specifically gain stamina, weights aren't the best, so a good amount of cardio (can be simple walking) and weightless exercises (like push-ups) can help. Alternate between these and more strenght-focused workouts alongside a better lifestyle, and the results will come.
