Most popular fitness programs (5x5, PPL, German Volume Training) are designed for younger men and don't translate well to women in their 40s. Hormonal recovery is slower, joint sensitivity higher, life demands greater. Programs that account for this work; generic ones often fail.
Where standard programs go wrong
Daily training assumed (most women in 40s recover better with 3-4 sessions). High-volume programs lead to injury more often. Same-weight progression every session may not fit cycle-related strength variations. Lack of warm-up time built into program.
What works better
3-4 strength sessions per week, full-body or upper/lower split. Cycle-aware programming (heavier sessions in follicular phase, lighter in luteal). Built-in warm-up time. Conservative weight progression with deload weeks every 4-6 weeks. Adequate sleep and protein non-negotiable.
Look for programs by trainers who specifically work with women in their 40s+ (Stacy Sims, Brianna Battles). Generic strength programs work in your 20s; matched programs work better in your 40s.