
With 45 minutes three days a week, run a simple full body A/B plan that hits five patterns each session: squat, hinge, push, pull, and core. In a typical apartment gym that means things like goblet squat or leg press, Romanian deadlift or hip thrust or trap bar deadlift if available, dumbbell bench or machine chest press, one arm dumbbell row or cable row or lat pulldown, and a side plank or farmer carry. Alternate two versions so joints get variety, do 2 to 3 work sets of 6 to 12 controlled reps per exercise, and rest about 90 to 120 seconds between sets. Warm up with 5 to 8 minutes of easy bike or treadmill, then 5 minutes of dynamic prep such as bodyweight squats, hip hinges with a dowel or broomstick, shoulder circles, and finish with one or two light ramp up sets before your first two lifts. If your lower back gets cranky, prioritize neutral spine bracing, start with hinges that keep the weight close to your body like dumbbell RDLs and hip thrusts, and add bird dogs, dead bugs, and side planks for 5 to 8 minutes at the end.
Pick starting weights using a two to three reps in reserve rule, meaning after your last rep you should feel like you could do two more with solid form, which is roughly a moderate RPE 7. Use double progression in an 8 to 12 rep range, add a rep each session until you hit the top of the range for all sets, then increase weight by the smallest jump available and drop back to the bottom of the range. Expect to add reps or a little weight most sessions for 3 to 6 weeks, then more like weekly. If a lift stalls twice in a row, hold the weight and try to add one rep somewhere or slow the lowering for more time under tension. Stop every set one or two reps short of failure, keep weekly volume around 6 to 10 hard sets per major muscle group, and take a lighter week every 6 to 8 weeks where you do about half the sets with the same weight. For form, film one set from the side and one from the front, and search for cues from reputable coaches like Alan Thrall for squat and deadlift, Starting Strength for the hip hinge and bracing, and Jeff Nippard for row and pulldown setup. Recovery keeps you from overdoing it, so walk on off days, sleep 7 to 8 hours, and aim for protein around 0.7 to 0.8 grams per pound of bodyweight with plenty of water. If pain is sharp or radiates and stop the lift and swap in a friendlier pattern.
Great plan. To fit everything into 45 minutes pair non-competing moves as loose supersets (goblet squat with one-arm row, RDL with bench), keeping the same total rest but alternating exercises which, yeah use a 360-degree brace with a 2-3 second controlled lower on every rep and start with a range of motion you own & expanding it week to week; as a desk worker, short hourly walks and a quick hip flexor stretch on off days will keep your back happier and... log sets, reps, and RIR so you can nudge progress without guessing.