Meditating for 10 minutes a day is infinitely better
than meditating for 70 minutes once a week. Try to
meditate frequently (every day if possible), even if that just
means sitting for a few minutes.
Start small. If you try to meditate for 30
minutes right from the start, I can almost guarantee that you will
get frustrated and discouraged. I recommend starting with five
minutes, and only increasing that time when you're comfortable.
Even if you sit for five minutes, and you find that your mind
wanders the whole time, you will still receive incredible benefits
from meditation.
Pick a gentle alarm. If your timer is loud and
jarring, anticipating the alarm will distract your attention during
meditation.
Meditate in a quiet place. Having less
distractions around you will naturally allow you to concentrate
better, and will make your meditation much more productive.
It's easiest to lose your attention during your
out-breath. Your in-breath is very pronounced and easy to
concentrate on, and most people's minds wander on their out-breaths
(me included). This is worth keeping in mind.
Be easy on yourself when your mind wanders.
It's easy to become frustrated with yourself when your mind
wanders, but don't. Your meditations will be much more productive
when you gently bring your attention back.
If you can't concentrate, try counting. Count
your breaths, until you reach five, and then start again. I use
this trick when I'm having a tough time concentrating.