WALK INTO ANY gym, and you’ll find guys doing something cringeworthy—from exhibiting crappy exercise form to doing useless routines that don’t really accomplish anything. (Surely you’ve seen gym fail videos of hip thrusts gone wrong…)

But these obvious errors are just two of the many possible ways you can screw yourself over in the gym. And while some of these mishaps may be minor, they can actually lead to huge setbacks in terms of gains.

To save time, get faster results, and make your workoutsmore effective, make sure you avoid these 10 common mistakes.

1. You wait for equipment to free up

Gym lines are bound to form during peak hours. The best fix? Head to the gym early in the morning or after 7p.m., once the pre-work and post-work crowds have cleared.

If your schedule isn’t that flexible, always have alternative options in the back of your mind in case the equipment you want is taken. For example, you can swap your back squats with a set of dumbbell goblet squats, which can be just as challenging and add an element of core strength. Come prepared with a Plan B and you’ll stay moving rather than wasting your time waiting for the bench to open up.

2. You skip warmups

Although it may save time, dodging the pre-workoutwarmup is a surefire way to get injured during a tough workout. Have a dedicated warmup that involves bodyweight exercises like lunges, squats, pushups, and jumping jacks to elevate your heart rate before you attack the weights head on. It doesn’t matter if you’re short on time; you need a warmup in your workout.

Furthermore, before a big compound lift—like a squat or a deadlift—start with a warmup set with higher reps at a lighter weight. It’ll further increase blood flow to your muscles, and help you cue up good form before you start going heavy. If you simply don’t have a ton of time to get in your lifting session, shorten rest periods and cut out a set of each exercise rather than ditching the warmup.

3. You don’t plan out your routine ahead of time

Walking into the gym without a plan in mind is a bit like heading to the grocery store without a shopping list. You’ll end up wandering aimlessly back and forth, spending way more time than necessary. Your plan of attack should be well thought out in advance. Include the exercises, sets, and reps as well as the order you want to do them in so you can plan your route around the weight room. Keep it in the notes of your smartphone or write them down if you get distracted by your phone.

If you’re working out with a buddy, take time to discuss the routine ahead of time so you’re both on the same page. This cuts down on talking and ensures you both get down to business.

4. You do cardio before you lift

Cardio is crucial to any man’s workout plan, but it can be detrimental when done at the wrong time. Completing a 30-minute jog before a set of heavy squats may increase your heart rate and act as a warmup, but by the time you get under the bar, you can be fatigued, which can lead to poor form—or, worse yet, injury. Instead, get your form-intensive lifting session done first, then hit the cardio area.