Can strength training tighten loose skin on my arms?

Order matters here. Nikkiey's rule is that nutrition is king and exercise is queen. She says visible arm definition for most women starts showing around 22-25% body fat or lower, and at 30-35% no amount of tricep work will give you defined arms. The muscle is there, it's just buried. Once you're losing fat on the right macros, strength training becomes the secret weapon, because the muscle it builds creates definition and gives your skin something to hold on to.

She's also candid that more volume isn't the answer on its own. Early on, she trained arms harder, added reps and burnout sets, and the results still weren't where they could have been until her nutrition was dialed in. Women who train hard but ignore nutrition often feel stronger without seeing the visual change.

And lifting heavy won't make you bulky. Nikkiey points out that declining testosterone after 40 makes muscle harder to build, not easier, so heavier lifting builds lean, defined muscle. If you want defined arms rather than turning bat wings into loose skin, she calls tricep training non-negotiable. Your skin isn't the problem. The plan just needs fat loss, protein and real muscle-building work together.