JR one Lifts

Junior One lifts. (This simply states that a young person or someone new to weightlifting is lifting.)
More Specific/Instructional:

Junior One, lift. (This is commanding someone nicknamed "Junior One" to lift something.)
Junior One lifts weights. (This indicates that "Junior One" engages in weightlifting activities.)
Junior, one lift per set. (This gives instructions on repetition count.)
Hypothetical scenario/story telling:

Junior One lifts with determination. (This adds detail suggesting emotional intention)
To give you the best expansion, I need more context. What do you want the expanded text to convey