1. Avoid over-training
It's easy to think that the more you do, the better you'll get. That's not always the case. Overdoing it will simply put you on the fast-track to injury.
Training requires different muscles to those we use in daily life. You'll find aches and strains in unsual places, and it might take a while to get used to these.
It's important to have a plan and stick to it. Don't push yourself to do too much.
Perhaps you're feeling under the weather, you've had a stressful day at work or just had a rough night's sleep. Listen to your body. And if you need to, take an extra rest day. You'll feel better for it.
2. Try different things
Mixing up your training is great for both body and mind.
Swimming, jogging, cycling or a session on the elliptical trainer will all boost your fitness, keep you interested and stave off the monotony of doing the same thing over and over again.
Gym classes and circuits are good for experimenting with a different tempo and intensity.
3. Stretching and core work
Dynamic stretching beforehand will improve the quality of your training session whilst static stretching afterwards will help your muscles get back to their normal state.
If you find stretching difficult then you could always try a beginner's class in Pilates or yoga. They're both excellent for developing your core/breathing control and will prepare your body for the rigours ahead.