The tried and true technique of lifting rocks, for instance, will do that quite nicely. All one has to do is to have a look at the scale and weight of the shields, swords, and armor used within the Center Ages to see what was achievable with primitive methods. The only downside to this type of training is the inherent limitations on what could be accomplished to isolate individual muscle mass. It really works effectively for large groups of muscle tissues performing complicated actions, but single-joint actions are challenging, at best.
This mix of 5 Chinese medicinal herbs cleans away …